Solution Program for Fizz Buzz Problem

#include <stdio.h>
#include <stdlib.h>

  /*
  * Solution Program for FizzBuzz (codeeval.com) - https://www.codeeval.com/open_challenges/1/
  */

int main(int argc,char *argv[])
{
        FILE *fp;
        int x,y,count,i;

        if (argc < 2) {
         printf("Error :- File not specified \n");
         exit(0);
        }

        fp = fopen (argv[1],"r");
        if (fp == NULL) {
                printf("Error :- Can't open file \n");
                exit(0);
        }
        while (fscanf(fp,"%d %d %d",&x,&y,&count) != EOF ) {
                printf("Read - X = %d Y = %d Count = %d\n",x,y,count);

                if ( x < 1 || x > 20 || y < 1 || y > 20 || count < 21 || count > 100) {
                        printf("Invalid Input - please use Ranges X[1-20] Y[1-20] Z[21-100]\n");
                        exit(0);
                }

                for (i =1; i <= count;i++) {
                        if(!(i%x) && !(i%y)){
                                putchar('F');
                                putchar('B');
                        } else if (!(i%x)) {
                                putchar('F');
                        } else if (!(i%y)) {
                                putchar('B');
                        } else {
                                printf("%d",i);
                        }
                        putchar(' ');
                }
                putchar('\n');
        }
        return 0;
}