How to read data(mainly string) from keyboard and write it in a .txt file?

Question

This is my code

#include<stdio.h>

int main()
{
char a[100];
FILE * fptr;

fptr = fopen("sujan.txt", "w");

if (fptr == NULL)
{
printf("Error while opening file....");
exit(1);
}

printf("Please Enter your text:\n");
scanf("%s", &a[100]);

fprintf(fptr, "%s", a[100]);

fclose(fptr);
return 0;
}

Answer 1

When dealing with strings (and more in general arrays) the name is already a pointer to the first element. So you have to pass to scanf and fprintf only the name of the string, %s needs the addres of the first element of the string to use it. Passing &a[100] you are passing the address of the 100th element.