Im programming a tiny music player for school project. And our teacher tell us we have to use linked list.
But i have this crash in my program without warnings, my function Afficher_Liste is working fine (its a function to view my linked list)
My structure which define a music
typedef struct Piste{
char *pTitle;
char *pArtist;
char *pPath;
struct Piste *pNext;
struct Piste *pPrev;
}Piste;
My function :
void Play_Music(Piste **pHead){
int choice;
int ctr = 1;
char * path_music;
path_music= (char*)malloc(200 * sizeof(char));
View_List(&ppDL);
Piste *pCur = *pHead;
printf("What music you want to play ?");
scanf("%d",&choice);
while(choix!=cptr){
pCur = pCur->pNext;
ctr++;
if(choice==cptr){
path_music= pCur->pPath;
}
}
printf("your choice is %s",path_music);
scanf("%d",choice);
}
Edit : the call of the function
void User_Mode(){
int choice;
char *search= NULL;
while(choice!= 4)
{
system("cls");
printf("---------- User Menu----------\n\n");
printf("1 - Search\n");
printf("2 - Play a music\n");
printf("3 - Back to menu\n");
printf("your choice?\n");
scanf("%d", &choice);
switch(choice){
case 1:
fflush(stdin);
search = (char*)malloc(200 * sizeof(char));
printf( "what do you want to listen ? : \n" );
scanf( "%[^\n]", seach);
fgetc( stdin );
if(search!=NULL){
search_music(search,&ppDL);
}
break;
case 2:
play_music();
break;
case 3:
main_menu();
break;
default:
system("cls");
printf("your choice isnt good\n\n");
user_mode();
}
}
}
Edit2 : tried to translate my code
Change your case statement to
case 2:
play_music( &ppDL );
break;
Related
I'm brand new to C and I'm trying to figure out what in the world is causing this. Another similar question said that I had to download another library but that hasn't fixed the issue. So, hopefully someone can spot my problem.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
enum Subject {SER=0, EGR=1, CSE=2, EEE=3} subject;
struct Course {
enum Subject subject;
int number;
char teacher[1024];
int hours;
} *course;
//place to store course information
struct Course* CourseCollection = NULL;
//number of courses in the collection. also the index of the next empty element.
int courseCount = 0;
void branching(char option);
void course_insert(struct Course course);
int main() {
char input_buffer;
printf("Welcome to ASU Class Schedule\n");
//menu and input loop
do {
printf("\nMenu Options\n");
printf("------------------------------------------------------\n");
printf("a: Add a class\n");
printf("d: Drop a class\n");
printf("s: Show your classes\n");
printf("q: Quit\n");
printf("\nTotal Credits: %d\n\n", courseCount);
printf("Please enter a choice ---> ");
scanf(" %c", &input_buffer);
branching(input_buffer);
} while (input_buffer != 'q');
return 0;
}
//takes a character representing an inputs menu choice and calls the appropriate
//function to fulfill that choice. display an error message if the character is
//not recognized.
void branching(char option) {
int prefix, courseNum, credits;
char instructor;
struct Course course1;
switch(option) {
case 'a' :
printf("Adding a class");
printf("\nWhat is the subject (SER=0, EGR=1, CSE=2, EEE=3)? ");
scanf(" %d", &prefix);
course1.subject = prefix;
printf("\nWhat is the course number (e.g. 334)? ");
scanf(" %d", &courseNum);
course1.number = courseNum;
printf("\nHow many credits is the class? ");
scanf(" %d", &credits);
course1.hours = credits;
printf("\nWhat is the name of the teacher? ");
scanf(" %s", &instructor);
strlcpy(course1.teacher, instructor, 1024);
printf(" %s %d", course1.subject, course1.number);
courseCount++;
course_insert(course1);
break;
case 'd' :
// TODO
break;
case 's' :
// TODO
break;
case 'q' :
printf("Goodbye ");
break;
default :
printf("Error: Invalid Input. Please Try Again. ");
break;
}
void course_insert(struct Course course) {
CourseCollection = malloc(sizeof(course)*courseCount);
}
}
The problem is a syntactical bug; the function definition for course_insert() is inside the curly braces of the function definition of branching(). You need to fix the curly braces:
void branching (char option)
{
// Code for function
}
void course_insert(struct Course course)
{
CourseCollection = malloc(sizeof(course)*courseCount);
}
I can't find the solution on how to view the data that we have entered before in a function that is used to enter information. Also, I'm using struct, not normal declaration and variable.
Here's the flow, I choose case 1 which will call addbook function where I will insert my data then later I will choose case 4 where the data that I just insert now supposed to be display on the screen but unfortunately it won't display the data. So, what should I do? It would be grateful if you guys could help me
This is my coding
struct book
{
char title[50];
char author[50];
int quantity;
int price;
};
struct book a;
void addbook();
//void searchbook();
//void deletebook();
void viewbook();
//void updatebook();
void returnfunc();
int main()
{
char choice;
do
{
printf("\n\n\t1.Add Book\n");
printf("\n\t2.Search Book\n");
printf("\n\t3.Delete Book\n");
printf("\n\t4.View Book\n");
printf("\n\t5.Update Book\n");
printf("\n\t6.Exit\n");
printf("\n\nPlease enter your choice :");
scanf("%d",&choice);
switch (choice)
{
case 1 :addbook();
break;
//case 2 :searchbook();
break;
//case 3 :deletebook();
break;
case 4 :viewbook();
break;
//case 5 :updatebook();
break;
case 6 :printf("THANK YOU !!");
break;
default :printf("Wrong Choice.Please enter Again");
break;
}
}
while(choice!=6);
return 0;
}
void addbook()
{
printf("\n============= PLEASE ADD NEW BOOK DETAILS ================");
int quantity;
FILE *fp;
printf("\n\nNumber of book to insert:");
scanf("%d", &quantity);
struct book a[quantity];
int i;
fp=fopen("Bibek.dat","ab+");
for(i=0;i<quantity;i++)
{
printf("Title:");
scanf("%s", &a[i].title);
printf("Author:");
scanf("%s", &a[i].author);
printf("Price:");
scanf("%d", &a[i].price);
printf("\n");
}
printf("\n\n---NEW BOOK DETAILS WAS SUCCESFULLY ADDED---\n\n");
}
//void searchbook()
//{
//printf("========SEARCH THE BOOK========");
//}
//void deletebook()
//{
//}
void viewbook(void)
{
FILE *fp;
int i=0,j;
system("cls");
printf("*********************************Book List*****************************");
printf(" TITLE AUTHOR QTY PRICE");
j=4;
fp=fopen("Bibek.dat","rb");
while(fread(&a,sizeof(a),1,fp)==1)
{
printf("%s",a.title);
printf("%s",a.author);
printf("%d",a.quantity);
printf("%d",a.price);
printf("\n\n");
j++;
i=i+a.quantity;
}
printf("Total Books =%d",i);
fclose(fp);
returnfunc();
}
void returnfunc(void)
{
{
printf(" Press ENTER to return to main menu");
}
a:
if(getch()==13) //allow only use of enter
main();
else
goto a;
}
//void updatebook()
//{
//}
The changes you need are rather easy and/or in the comments. Please try it. You can modify my attempts to fix your code.
#include <stdio.h>
#include <stdlib.h>
struct book {
char title[50];
char author[50];
int quantity;
int price;
};
struct book a;
void addbook();
//void searchbook();
//void deletebook();
void viewbook();
//void updatebook();
void returnfunc();
int main() {
int choice;
do {
printf("\n\n\t1.Add Book\n");
printf("\n\t2.Search Book\n");
printf("\n\t3.Delete Book\n");
printf("\n\t4.View Book\n");
printf("\n\t5.Update Book\n");
printf("\n\t6.Exit\n");
printf("\n\nPlease enter your choice :");
scanf("%d", &choice);
switch (choice) {
case 1 :
addbook();
break;
//case 2 :searchbook();
break;
//case 3 :deletebook();
break;
case 4 :
viewbook();
break;
//case 5 :updatebook();
break;
case 6 :
printf("THANK YOU !!");
break;
default :
printf("Wrong Choice.Please enter Again");
break;
}
}
while (choice != 6);
return 0;
}
void addbook() {
printf("\n============= PLEASE ADD NEW BOOK DETAILS ================");
int quantity;
FILE *fp;
printf("\n\nNumber of book to insert:");
scanf("%d", &quantity);
struct book a[quantity];
int i;
fp = fopen("Bibek.dat", "ab+");
for (i = 0; i < quantity; i++) {
printf("Title:");
scanf("%s", a[i].title);
printf("Author:");
scanf("%s", a[i].author);
printf("Price:");
scanf("%d", &a[i].price);
printf("\n");
}
fwrite(a, sizeof(a) , 1, fp);
fclose(fp);
printf("\n\n---NEW BOOK DETAILS WAS SUCCESFULLY ADDED---\n\n");
}
void viewbook(void) {
FILE *fp;
int i = 0, j;
//system("cls");
printf("*********************************Book List*****************************");
printf(" TITLE AUTHOR QTY PRICE\n");
j = 0;
fp = fopen("Bibek.dat", "rb");
while (fread(&a, sizeof(a), 1, fp) == 1) {
printf("%s ", a.title);
printf("%s ", a.author);
//printf("%d", a.quantity);
printf("%d ", a.price);
printf("\n\n");
j++;
i = i + a.quantity;
}
printf("Total Books =%d", j);
fclose(fp);
returnfunc();
}
void returnfunc(void) {
printf(" Press ENTER to return to main menu");
}
Test
/a.out
1.Add Book
2.Search Book
3.Delete Book
4.View Book
5.Update Book
6.Exit
Please enter your choice :1
============= PLEASE ADD NEW BOOK DETAILS ================
Number of book to insert:2
Title:foo
Author:carol
Price:2
Title:bar
Author:mallory
Price:3
---NEW BOOK DETAILS WAS SUCCESFULLY ADDED---
1.Add Book
2.Search Book
3.Delete Book
4.View Book
5.Update Book
6.Exit
Please enter your choice :4
*********************************Book List***************************** TITLE AUTHOR QTY PRICE
foo carol 2
bar mallory 3
Total Books =2 Press ENTER to return to main menu
1.Add Book
2.Search Book
3.Delete Book
4.View Book
5.Update Book
6.Exit
Please enter your choice :
I'm trying to write a simple phone book program. I have completed the first function and according to I observe it works without error. However, in second function (which is ""display()"") I can't show to user after I enter person knowledge. I'm working with binary mode. What the problem is in second function I couldn't understand. If you examine and help I'll be satisfied. Thanks in advance.
#include <stdio.h>
#include <stdlib.h> // "stdlib" library contains of exit() function
#include <malloc.h> // "malloc" library contains of malloc() function
#include <Windows.h> // "Windows" library contains of Sleep() function which waits the system as you want
#include <io.h> // "io" library contains of filelength() function
struct personKnowledge
{
char name[32];
char surname[32];
char number[32];
};
FILE *ptrFILE,*ptrFILE1;
long int recordLength,totalRecordLength,location;
static int counter = 0;
int number,totalRecordNumber;
void newRecord();
void display();
void deletE();
void add();
void update();
int main()
{
int choice;
do
{
printf("\n\t\t --- Phone Book Program ---");
printf("\n\n\t\t 1) New record"); // The options are being presented to user
printf("\n\n\t\t 2) Display person knowledge");
printf("\n\n\t\t 3) Delete someone");
printf("\n\n\t\t 5) Update person knowledge");
printf("\n\n\t\t 6) Exit");
printf("\n\n\nEnter your choice: ");
scanf("%d", &choice);
switch (choice)
{
case 1:
{
newRecord();
break;
}
case 2:
{
display();
break;
}
case 3:
{
break;
}
case 4:
{
break;
}
case 5:
{
break;
}
case 6:
{
printf("\nWorking has been completed.\n");
return 0;
}
default:
{
printf("\nWrong entry! The program has been terminated.\n");
break;
}
}
} while (choice >= 1 && choice <= 6);
return 0;
}
void newRecord()
{
if ((ptrFILE = fopen("Phone Book.dat", "wb")) == NULL)
{
printf("The file couldn't open\n");
exit(0);
}
system("cls"); // Screen is being cleaned
struct personKnowledge *p; // p means person
p = (struct personKnowledge *)malloc(sizeof(struct personKnowledge)); // Memory is being allocated
fflush(stdin);
recordLength = sizeof(p); // size of p
printf("|| For the %d. person ||\n", counter+1);
printf("\n\Express person name: "); // User is entering the person's knowledge and they are being saved in file
gets(p->name);
printf("Express %s's surname: ", p->name);
gets(p->surname);
printf("Express %s's number: ", p->name);
gets(p->number);
fwrite(&(*p), recordLength, 1, ptrFILE);
printf("\nPlease wait, information is saving to file..\n");
Sleep(750);
printf("*-* Saving operation has been completed succesfully. *-*\n");
free(p);
counter++;
fclose(ptrFILE);
}
void display()
{
if ((ptrFILE = fopen("Phone Book.dat", "rb")) == NULL)
{
printf("The file couldn't open\n");
exit(0);
}
system("cls"); // Screen is being cleaned
struct personKnowledge *s; // s means searching
s = (struct personKnowledge *)malloc(sizeof(struct personKnowledge));
fflush(stdin);
recordLength = sizeof(s);
totalRecordLength = filelength(fileno(ptrFILE));
totalRecordNumber = totalRecordLength / recordLength;
printf("\n\nExpress person record number which you search: ");
scanf("%d", &number);
location = (number - 1)*recordLength;
fseek(ptrFILE, location, SEEK_SET);
fread(&(*s), recordLength, 1, ptrFILE);
printf("\n*-* Person knowledge which you search *-*\n");
Sleep(750);
printf("Name: %s\n", s->name);
printf("Surname: %s\n", s->surname);
printf("Number: %s\n", s->number);
free(s);
fclose(ptrFILE);
}
recordLength = sizeof(p);
is wrong, this is the size of the pointer which is normally 4 on a 32 bit system and 8 on a 64 bit syste.
you need
recordLength = sizeof(*p);
or
sizeof(struct personKnowledge);
which gives you the size of the structure pointed by p.
I have an assignment to write a program for supporting an art gallery in C. It has to be menu based program using lists. I wrote the first function of the menu and I need some help writing the other three. So I have a structure of an unique code of the painting, author's name, painting's name, price, year of the painting. I have to create a function deleting a painting using the unique code, print out all the info about every painting and modifying a painting again using said code. The data has to be in a dynamic type structure using a linked list. This is the program so far.
#include <stdio.h>
void addPainting(void);
void erasePainting(void);
void printData(void);
void modifyData(void);
int main()
{
struct paintings
{
char code[20];
char name[50];
char paintingName[50];
double price;
int year;
}painting[100];
int choice;
do
{
printf("Menu\n");
printf("To add a painting press 1.\n");
printf("To erase a painting press 2.\n");
printf("To print data for all paintings by authors alphabetically press 3.\n");
printf ("To modify data for a painting press 4.\n");
printf("To exit the program press 5.\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
{
addPainting();
break;
}
case 2:
{
erasePainting();
break;
}
case 3:
{
printData();
break;
}
case 4:
{
modifyData();
break;
}
default: printf ("Wrong choice. Try again\n");
break;
}
}while (choice !=5);
void addPainting()
{
FILE *fp;
struct paintings painting;
printf("Enter code:");
scanf("%s", &painting.code);
printf("Enter the name of the author:");
scanf("%s", &painting.name);
printf("Enter the name of the painting:");
scanf("%s", &painting.paintingName);
printf("Enter price:");
scanf("%lf", &painting.price);
printf("Enter the year of creation:");
scanf("%d", &painting.year);
if ((fp=fopen("paintings","wb"))==NULL)
exit(1);
if ((fwrite (&painting,sizeof(painting),1,fp)!=1))
exit(2);
fclose(fp);
}
}
First problem: You are missing the closing brace ( } ) for the main() function. (but I am sure you knew that)
The reason for the struct size error is that you are attempting to create an instance of struct painting in the void addPainting() function, when it was created with local scope in the main function, and therefore it is not visible to the function. Create struct painting with global scope if you want to use it this way:
This will build (and run) but only for the functions defined, the others are commented out. There are other problems you will have to work out, or ask about.
EDITED to fix scanf() statements, show use of fopen()/fclose(), create and write strings using sprintf()/fputs()...
void addPainting(void);
//void erasePainting(void);
//void printData(void);
//void modifyData(void);
typedef struct //created with global scope, visible to all functions
{
char code[20];
char name[50];
char paintingName[50];
double price;
int year;
}PAINTING;
PAINTING painting[100];//array of instance of PAINTING
#define PATH "C:\\play\\painting.txt" //edit to your need
int main()
{
int choice;
do
{
printf("Menu\n");
printf("To add a painting press 1.\n");
printf("To erase a painting press 2.\n");
printf("To print data for all paintings by authors alphabetically press 3.\n");
printf ("To modify data for a painting press 4.\n");
printf("To exit the program press 5.\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
{
addPainting();
break;
}
case 2:
{
//erasePainting();
break;
}
case 3:
{
//printData();
break;
}
case 4:
{
//modifyData();
break;
}
default: printf ("Wrong choice. Try again\n");
break;
}
}while (choice !=5);
}
void addPainting(void)
{
FILE *fp;
char stringToWrite[80];
//Note: this function could be prototyped with an int argument
// to be used as an index for the array arguments of your
// structure. Currently, the indexes are hard-coded to 0,
printf("Enter code:");
//scanf("%s", &painting[0].code);
scanf("%s", painting[0].code); //& not needed for char array (char *) et. al.
printf("Enter the name of the author:");
scanf("%s", painting[0].name);
printf("Enter the name of the painting:");
scanf("%s", painting[0].paintingName);
printf("Enter price:");
scanf("%lf", &painting[0].price);
printf("Enter the year of creation:");
scanf("%d", &painting[0].year);
fp = fopen (PATH, "a");//open for create/append text file (not write binary, "wb")
if(fp)
{
sprintf(stringToWrite, "Painting Code is: %s\n", painting[0].code);
fputs(stringToWrite, fp);
// do others same way...
//...
fclose(fp);
}
}
I'm kind of new to programming C with Code::Blocks(Version 12.11), started this semester in my college, but I manage.
I recently learned in class about pointers, memory allocation and dynamic arrays(none are my forte), and I incorporated them in my program(and it compiles)
Now the problem comes when I run the Program and go to Menu -> Add a Product, the program terminâtes when I input a price and I receive "Process Returned -1073741819 (0xc0000005)".
I did some research and found out it's an access violation but I don't really understand how to correct it.
Regards
Here's the code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define maxCharName 64
#define maxCharUserPass 8
#define maxCharId 5
// Product Structure
typedef struct{
char name[maxCharName];
char idCode[maxCharId];
float price;
float stock;
}product;
// DataBase of Products
typedef struct{
int sizeT;
product *array;
} TProducts;
TProducts a;
// Press any Key on the Keyboard to Proceed
void pressKeyToContinue(){
puts("\n\n\n Please Press any Key to Continue...");
getchar();
}
// Start Page
void startPage(){
puts("\n\n\n -- Welcome to WeePro Manager --\n\n");
puts(" -- Version 1.0 --\n\n\n\n");
puts(" -- Developped By: Nick --");
pressKeyToContinue();
system("cls");
}
// Program Terminator
void shutdown(){
puts("\n\n\n Good-Bye");
pressKeyToContinue(); // Awaits User Input
exit(0);
}
// Asks User Information for Verification
int userLogin(){
char userName[maxCharUserPass] = "WPuser";
char inputUserName[maxCharUserPass];
char passWord[maxCharUserPass] = "12345";
char inputPassWord[maxCharUserPass];
printf("Username? ");
scanf("%s",inputUserName); fflush(stdin);
printf("Password? ");
scanf("%s", inputPassWord); fflush(stdin);
system("cls");
if((strcmp(userName, inputUserName) == 0)&&(strcmp(passWord, inputPassWord) == 0)){
return 1;
}else{ return 0;}
}
// Lists All Products With their Respective Information
void listAll(){
int idx = 0;
puts("List:");
while((idx < a.sizeT)&&(a.array[idx].name != NULL)){
printf(":::%s ( id: %s )", a.array[idx].name, a.array[idx].idCode);
printf("Price: %6.2f eur/g", a.array[idx].price);
printf("Stock: %6.2f g", a.array[idx].stock);
idx++;
}
pressKeyToContinue();
system("cls");
}
// Input Product ID Code
char* inputIdCode(){
char* tempIdCode;
puts("ID Code?");
scanf("%s", tempIdCode);
system("cls");
return tempIdCode;
}
// Search By ID Code
int searchIdCode(){
int idx = 0;
char* tempIdCode;
tempIdCode = inputIdCode();
do{
if(strcmp(a.array[idx].idCode, tempIdCode) == 0){
return idx;
}else{
idx++;
}
}while(idx < a.sizeT);
puts("No Product With Such an ID Code!");
return -1;
}
// Input Product Name
char *inputProductName(int length){
char name[maxCharName];
puts("Product Name?");
scanf("%s", name); fflush(stdin);
system("cls");
return name;
}
// Input Product Price
float inputProductPrice(int length){
float price;
puts("Product Price?");
scanf("%f", price); fflush(stdin);
system("cls");
return price;
}
// Input Product Stock
float inputProductQuantity(int length){
float quantity;
puts("Product Stock?");
scanf("%f", quantity); fflush(stdin);
system("cls");
return quantity;
}
/////////////////
// Add Product //
/////////////////
// New Product Adder
void addProduct(){
char* tempStr;
float temp;
if(a.sizeT == 0){
a.sizeT = 1;
a.array = (product*)malloc((a.sizeT)*sizeof(product));
}else{
a.sizeT++;
a.array = (product*)realloc(a.array, (a.sizeT)*sizeof(product));
}
tempStr = inputProductName(a.sizeT);
strcpy(a.array[a.sizeT].name, tempStr);
temp = inputProductPrice(a.sizeT);
temp = inputProductQuantity(a.sizeT);
system("cls");
}
void transaction(){}
////////////////////
// Delete Product //
////////////////////
// Delete Product
void deleteProduct(){
int idx, idxPro;
char* tempIdCode;
puts("Delete Which Product?\n");
tempIdCode = inputIdCode();
idxPro = searchIdCode(tempIdCode);
idx = idxPro + 1;
while(idx < a.sizeT){
a.array[idx] = a.array[idx+1];
idx++;
}
a.array = realloc(a.array, (a.sizeT-1)*sizeof(product));
}
//Product Information Modifier
void modifyProduct(){
char choice;
int tabLength;
do{
puts("Modify What?\n");
puts(" -> [N]ame\n");
puts(" -> [P]rice\n");
puts(" -> [S]tock\n\n");
puts(" -> [R]eturn to Previous Menu"); // Prints the Menus' Options
scanf("%c", &choice);
choice = toupper(choice); // Save Users' Choice And Up Case
fflush(stdin);
switch(choice){
case 'N':
system("cls");
tabLength = searchIdCode();
inputProductName(tabLength);
break;
case 'P':
system("cls");
tabLength = searchIdCode();
inputProductPrice(tabLength);
break;
case 'S':
system("cls");
tabLength = searchIdCode();
inputProductQuantity(tabLength);
break;
case 'R':
system("cls");
returnToMenu2();
break;
default:
puts("Something Went Wrong!\n");
pressKeyToContinue();
system("cls");
}
}while(choice != 'o');
}
// Sub-Menu Interface
void menu(){
char choice;
do{
puts("Please Make Your Selection.\n");
puts(" -> [A]dd a New Product\n");
puts(" -> [M]odify a Product\n");
puts(" -> [D]elete a Product\n\n");
puts(" -> [R]eturn to Main Menu"); // Prints the Menus' Options
scanf("%c", &choice); fflush(stdin);
choice = toupper(choice); // Save Users' Choice And Up Case
switch(choice){
case 'A':
system("cls");
addProduct();
break;
case 'M':
system("cls");
modifyProduct();
break;
case 'D':
system("cls");
deleteProduct();
break;
case 'R':
system("cls");
returnToMenu1();
break;
default:
puts("Something Went Wrong!\n");
pressKeyToContinue();
system("cls");
}
}while(choice != 'o');
}
// Return To Ma
> Blockquote
in Menu
void returnToMenu2(){
menu();
}
// Main Menu
void controlPanel(){
char choice;
do{
puts("Please Make Your Selection.\n");
puts(" -> [T]ransaction\n");
puts(" -> [M]enu\n");
puts(" -> [L]ist\n");
puts(" -> [S]hutdown"); // Prints the Panels' Options
scanf("%c", &choice); fflush(stdin);
choice = toupper(choice); // Save Users' Choice And Up Case
switch(choice){
case 'T':
system("cls");
transaction();
break;
case 'M':
system("cls");
menu();
break;
case 'L':
system("cls");
listAll();
break;
case 'S':
system("cls");
shutdown();
break;
default:
puts("Something Went Wrong!\n");
pressKeyToContinue();
system("cls");
}
}while(choice != 'o');
}
// Return To Main Menu
void returnToMenu1(){
controlPanel();
}
int main(){
int loginSuccess=1;
//loginSuccess = userLogin();
switch(loginSuccess){
case 0:
shutdown();
break;
case 1:
startPage();
controlPanel();
break;
}
}
An attempt is being made to write to randon memory, via the uninitialized pointer tempIdCode:
char* inputIdCode(){
char* tempIdCode;
puts("ID Code?");
scanf("%s", tempIdCode);
system("cls");
return tempIdCode;
}
You need to allocate memory for tempIdCode before attempting to write to it. You must use malloc() here (and not return the address of a local array):
char* tempIdCode = malloc(20);
if (tempIdCode)
{
/* The format specifier "%19s" instructs scanf()
to read at most 19 characters, one less than
allocated to allow for terminating null character
written by scanf(), to prevent potential buffer
overrun. */
scanf("%19s", tempIdCode);
}
The caller of the function must explicitly check for a return NULL pointer. The caller must also free() the allocated memory.
This is a killer:
// Input Product Name
char *inputProductName(int length){
char name[maxCharName];
puts("Product Name?");
scanf("%s", name); fflush(stdin);
system("cls");
return name;
}
The reference returned by this function points to an already freed block of memory on the stack, as char name is only valid as long the program is inside the function name is declared in.
When leaving the function name is freed automagically, so any dereferencing of the function's result leads to UB, as it most propably will be accessing unallocated memory.
To solve this you might like to pass in a buffer, where to read the data into:
// Input Product Name
char * inputProductName(int length, char * name){
puts("Product Name?");
scanf("%s", name); fflush(stdin);
system("cls");
return name;
}
and call it like this:
// New Product Adder
void addProduct(){
char* tempStr;
float temp;
if(a.sizeT == 0){
a.array = malloc((a.sizeT)*sizeof(product));
}else{
a.array = realloc(a.array, (a.sizeT)*sizeof(product));
}
a.sizeT++;
inputProductName(a.sizeT, a.array[a.sizeT].name);
...