cannot write/'w' FILE in function - c

Question

I don't know what is wrong with this coding. I even use 'a' to output the display to for Name, Address, and Phone Number. for Read/'r' FILE my coding succefully run without any error but when try to Write FILE suddenly it cannot open the file or NULL.
This is a snapshot of the error
This is the function that I want to diplay the output in FILE of output.txt
void display(char cName[], char cAddress[], char cPhoneNo[])
{
output = fopen("output.txt", "w");
printf("\n_________________________________________________");
printf("\n_________________________________________________");
fprintf(output, "\n\n Name\t\t: %s", cName);
fprintf(output, " Address\t: %s", cAddress);
fprintf(output, " PhoneNo\t: %s", cPhoneNo);
fclose(output);
}
This is the whole coding
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void cookiesList(char[20][5], char* [], float*);
void infoInput(char[], char[], char[]);
int order(char* [], int*);
void display(char[], char[], char[]);
void outputDisplay(char[20][5], char[20][40], int[], float[], float, size_t, float, float, float, float);
float calculateSubTotal(float, int, float*);
float bundle(char*, char*, float);
FILE* input, * output;
int main()
{
char customerName[50], customerAddress[70], customerPhoneNo[12];
char productCode[20][5], productName[20][40];
int productQuantity[20], decision, orderSubTotal=0;
float productPrice[20], productPriceTotal[20];
size_t counter = 0;
float cashback, discount, finalprice;
char bundleName[10], bundleItem[32];
float bundlePrice;
printf("\t\t\t#-------------------------------------------------------#");
printf("\n\t\t\t|\t WELCOME TO ONLINE COOKIES PEOPLE STORE \t|");
printf("\n\t\t\t#-------------------------------------------------------#\n");
infoInput(customerName, customerAddress, customerPhoneNo);
do
{
decision = order(&productCode[counter], &productQuantity[counter]);
cookiesList(productCode[counter], &productName[counter], &productPrice[counter]);
orderSubTotal = orderSubTotal + calculateSubTotal(productPrice[counter], productQuantity[counter], &productPriceTotal[counter]);
counter++;
} while (decision == 1);
bundlePrice = bundle(&bundleName, &bundleItem, orderSubTotal);
if ((15 <= orderSubTotal) && (orderSubTotal < 76))
{
cashback = 1.5;
discount = 0;
}
else if ((76 <= orderSubTotal) && (orderSubTotal < 151))
{
cashback = 2.5;
discount = orderSubTotal * 0.05;
}
else if (151 <= orderSubTotal)
{
cashback = 3.5;
discount = orderSubTotal * 0.1;
}
finalprice = orderSubTotal - discount + bundlePrice;
display(customerName, customerAddress, customerPhoneNo);
outputDisplay(productCode, productName, productQuantity, productPriceTotal, orderSubTotal, counter
, discount, cashback, finalprice, bundlePrice);
return 0;
}
void cookiesList(char pdtCode[][5], char* pdtNm[], float* pdtprice)
{
if ((strcmp(pdtCode, "c111") == 0) || (strcmp(pdtCode, "C111") == 0))
{
strcpy(pdtNm, "Dark Chocolate Chips");
*pdtprice = 15.0;
}
else if ((strcmp(pdtCode, "c112") == 0) || (strcmp(pdtCode, "C112") == 0))
{
strcpy(pdtNm, "Premium Assorted Shortbread Cookies");
*pdtprice = 25.5;
}
else if ((strcmp(pdtCode, "c113") == 0) || (strcmp(pdtCode, "C113") == 0))
{
strcpy(pdtNm, "Hawaiian Salted Coconut");
*pdtprice = 17.5;
}
else if ((strcmp(pdtCode, "c114") == 0) || (strcmp(pdtCode, "C114") == 0))
{
strcpy(pdtNm, "Oatmeal & Raisins Cookies");
*pdtprice = 13.0;
}
else if ((strcmp(pdtCode, "c115") == 0) || (strcmp(pdtCode, "C115") == 0))
{
strcpy(pdtNm, "Chocolate Caramel Almond Cookies");
*pdtprice = 16.0;
}
else
{
exit(cookiesList);
}
}
void infoInput(char cNm[], char cAdrs[], char cPhN[])
{
input = fopen("file.txt", "r");
if (input == NULL) {
printf("ERROR! File does not have any input");
return(-1);
}
else {
//fgets(cNm, 50, fp);
fscanf(input, "\n%[^\n]%*c", cNm);
printf("\n Name entered\t\t: %s", cNm);
//fgets(cAdrs, 70, fp);
fscanf(input, "\n%[^\n]%*c", cAdrs);
printf("\n Address entered\t: %s", cAdrs);
//fgets(cPhN, 12, fp);
fscanf(input, "\n%[^\n]%*c", cPhN);
printf("\n Phone No. entered\t: %s", cPhN);
printf("\n ----------------Product-------------------");
printf("\n C111: Dark Chocolate Chips");
printf("\n C112: Premium Assorted Shortbread Cookies");
printf("\n C113: Hawaiian Salted Coconut");
printf("\n C114: Oatmeal & Raisins Cookies");
printf("\n C115: Chocolate Caramel Almond Cookies");
printf("\n ------------------------------------------\n");
}
fclose(input);
}
int order(char* pdtCdLt[], int* pdtQtyLt)
{
int YorN;
printf(" Enter Product Code\t: ");
scanf(" %s", pdtCdLt);
printf(" Enter Quantity\t\t: ");
scanf(" %d", pdtQtyLt);
printf(" Want to add other product?( Yes = 1 | No = 0 ) ");
scanf(" %d", &YorN);
return YorN;
}
void display(char cName[], char cAddress[], char cPhoneNo[])
{
output = fopen("output.txt", "w");
printf("\n_________________________________________________");
printf("\n_________________________________________________");
fprintf(output, "\n\n Name\t\t: %s", cName);
fprintf(output, " Address\t: %s", cAddress);
fprintf(output, " PhoneNo\t: %s", cPhoneNo);
fclose(output);
}
void outputDisplay(char pdtCd[][5], char pdtName[][40], int pdtQty[], float pdtPriceTtl[], float odrSubTotal, size_t index
, float disc, float CashB, float Fprice, float bdlPri)
{
//yolo = fopen("output.txt", "w");
/*if (yolo == NULL) {
printf("Could Not open file!");
return 0;
}*/
printf("\n Item\t\tQuantity\t\tPrice(RM)\n");
for (size_t i = 0; i < index; i++)
{
printf("\n %s", pdtName[i]);
printf("\n %s\t\t%d\t\t\t%.2f", pdtCd[i], pdtQty[i], pdtPriceTtl[i]);
}
printf("\n\n\t\t\t\t\t============");
printf("\n\t\t\t Subtotal\t%.2f", odrSubTotal);
if (bdlPri > 0)
{
printf("\n\t\t Bundle Price\t%.2f", bdlPri);
}
if (disc > 0)
{
printf("\n\t\t\t Discount\t%.2f", disc);
}
printf("\n\t\t\t CashBack\t%.2f", CashB);
printf("\n\t\t\tFinal price\t%.2f\n", Fprice);
//fclose(yolo);
}
float calculateSubTotal(float pdtPri, int pdtQuanti, float* pdtPTtl)
{
float subTtl;
*pdtPTtl = pdtPri * ((float)pdtQuanti);
return *pdtPTtl;
}
float bundle(char* bdlNm, char* bdlItm, float odrSubTtl)
{
int yorn;
float bdlPrice;
printf("\n Do you want to choose any bundle?");
printf("\n *Every bundle is RM 5 each.( Yes = 1 | No = 0 ) ");
scanf(" %d", &yorn);
if (yorn == 1)
{
printf("\n\t#-----------------------------Type of Bundle----------------------------#");
printf("\n\t|\t\t\t|\t\t\t|\t\t\t|");
printf("\n\t|\t Bundle A \t|\t Bundle B \t|\t Bundle C \t|");
printf("\n\t|\tRecycle Bag\t|\tRecycle Bag\t|\tRecycle Bag\t|");
printf("\n\t|\t & \t|\t & \t|\t & \t|");
printf("\n\t|\t NoteBook \t|\tWater Bottle\t|\tMark Cup\t|");
printf("\n\t|_______________________|_______________________|_______________________|\n");
retry:
printf("\n A = Bundle A, B = Bundle B, C = Bundle C ");
printf("\n Choose Your wanted Bundle : ");
fflush(stdin);
scanf(" %c", &(*bdlNm));
if ((*bdlNm == 'a') || (*bdlNm == 'A'))
{
strcpy(bdlItm, "Recycle bag and Notebook");
}
else if ((*bdlNm == 'b') || (*bdlNm == 'B'))
{
strcpy(bdlItm, "Recycle Bag and Water Bottle");
}
else if ((*bdlNm == 'c') || (*bdlNm == 'C'))
{
strcpy(bdlItm, "Recycle bag and Mark Cup");
}
else
{
printf("\n#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#");
printf("\n{\t\t\t\t}");
printf("\n }---------ERROR INPUT---------{");
printf("\n{\t\t\t\t}");
printf("\n#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~#");
}
bdlPrice = 5;
}
else
{
bdlPrice = 0;
}
return bdlPrice;
}

Answer 1

What are your OS and IDE?
I think that you are using Windows & VS now.
If you are running this program in Windows, Please start IDE with "Run as Administrator" like below.