ftell returning -1 and crashing program

Question

Can anyone please tell me what I'm doing wrong here with ftell?

I'm just messing around in C, and I've found that the following code sends me a terminal message of -1 meaning an error according to https://publib.boulder.ibm.com/infocenter/zos/v1r13/index.jsp?topic=%2Fcom.ibm.zos.r13.bpxbd00%2Fftell.htm, and crashes the program.

What am I doing incorrectly? Is it something to do with pointers?

Thanks

#include <stdio.h>
#include <string.h>

int main()
{
    FILE * f;
    char * s = "Hey Buddy!";
    f = fopen("myFile.txt", "w");

    int count = strlen(s);

    for (int i = 0; i < count; i++)
    {
        printf("%d\n", ftell(i));
        fputc(s[i], f);
    }

    fclose(f);
    return 0;
}

The program is supposed to iterate over 's' (printing it one letter at a time to f), while also printing into the terminal, how far along the array it has traversed. 0 = H, 1 = e, 2 = y, etc

Answer 1

You need to pass f as the argument to ftell, not i, since ftell expects a pointer to a FILE object.