#include <stdio.h>
int main (int argc, const char * argv[])

{
    FILE *fp;
    fp=fopen("/Users/--------/Desktop/C.txt", "w");
    putc("C", "/Users/-------/Desktop/C.txt");
    fclose(fp);
}

putc('C', fp);

int putc(int c, FILE *stream);

putc('C', fp);

putc('C', fp);