C program to get user input and validate from .dat FILES - c

Question

details about the questions ..........................................................................
/*here is my edited code . You may try create a random credential on
dat file . I have edited the code and add on structure , however my
login part seems not initializing my input from the dat file. */.
the login part unable to validate if username is already exist in the dat file . the code will just skipped to "Kindly key in correct password " even if the username is exist in the dat file.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <conio.h>
struct login1{
char username[20];
char password[15];
char name[20];
char address[30];
char pnum[12];
};
void login(void)
{
FILE*fptr;
fptr = fopen("customertest.dat","r");
char username[20];
char password[15];
int try=0;
struct login1 l;
if(fptr == NULL)
{
printf("Error! The file does not exist.");
exit(0);
}
system("CLS");
printf("\nInsert username : ");
scanf("%s", username);
printf("\nInsert password : ");
scanf("%s", password);
//while(fread(&l, sizeof(l), 1, fptr))
if((fscanf(fptr,"%s %s ", username, password))!=EOF)
{
if(strcmp(username, l.username)==0 && strcmp(password,
l.password)==0)
{
printf("\nLogin sucess");
printf("\nWelcome %s \n", l.username);
exit(0);
}
else if (strcmp(username, l.username) == 0 && strcmp(password,
l.password) == 1)
{
printf("Kindly key in correct password ");
exit(0);
}
else
{
printf("Kindly key in correct username and password");
exit(0);
}
}
fclose(fptr);
}
void registration(void) {
FILE*fptr;
fptr = fopen("customertest.dat","a+");
struct login1 l;
if(fptr == NULL)
{
printf("Error! The file does not exist.");
exit(0);
}
system("CLS");
printf("\nPlease enter the username : ");
scanf("%s",l.username);
fprintf(fptr, "%s\t" , l.username);
printf("\nPlease enter the password : ");
scanf("%s",l.password);
fprintf(fptr, "%s\t" , l.password);
printf("\nPlease enter your name : ");
scanf("%s",l.name);
fprintf(fptr, "%s\t" , l.name);
printf("\nPlease enter your address : ");
scanf(" %[^\n]s", l.address); // The [] is the scanset character.
[^\n] tells that while the input is not a newline ('\n') take input.
fprintf(fptr, "%s\t" , l.address);
printf("\nPlease enter your phone number : ");
scanf("%s",l.pnum);
fprintf(fptr, "%s\t" , l.pnum);
fprintf(fptr, "\n\n*********************************************
\n\n");
//fprintf(fptr, "%s\t%s\t%s\t%s\t%s\t" l.username, l.password,
l.name, l.address, l.pnum );
//fwrite(&l, sizeof(l), 1,fptr);
fclose(fptr);
printf("\nThank you. Your information is now saved to our database
!\n");
printf("You may now login to the website using to your username >>
%s <<\n\n\n", l.username);
printf("Registration process will exit now ! ");
}
int main() {
int opt;
printf("Kindly choose your action ? \n");
printf("Please key in as 1 for login and 2 for registration :\t");
scanf("%d" , &opt);
switch (opt)
{
case 1:
if (opt == 1)
printf("Welcome to Login page\n");
login();
case 2:
if (opt == 2)
printf("\nWelcome to Registration page ! \n");
registration();
default:
printf("\n\n\nKey in correct number either 1 or 2 . Program will exit
now ! ! ! \n\n\n");
}
}