Question

I am trying to read a file in C. But when I read, and write it to stdout it prints @ also which there is no in my file. What is the reason?

    #include <stdio.h>

int main() {

FILE *fp;
int br;
char buffer[10];
int i;
fp = fopen("a.txt","r");
while(1) {
        br = fread(buffer,1,10,fp);
        printf("%s",buffer);
        if (br==0)
                break;
        }
}

Output:

1234567891@2345678912@3456789
12@3456789
12@

The file:
123456789123456789123456789

Answer 1

Dynamically allocate your buffer and have it be initialized to zeros like this:

  char *buffer = calloc(1, 11);

   <do your read loop>

   free(buffer)

This way you get the zero byte at the end which will terminate the string when printing it. When C prints a string it expects it to be terminated by a NULL (or 0) byte.