Triangle? (files)

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

int main() {
FILE *s1, *s2;
int a, b, c;

s1 = fopen("bit.txt", "r");
s2 = fopen("bit2.txt", "w");

if (!s1)
printf("Error open bit.txt\n");
else
{
while (!feof(s1))
{
fscanf(s1, "%d %d %d\n", &a, &b, &c);
if ((a + b > c) && (a + c > b) && (b + c > a)) {
fprintf(s2, "%d %d %d\n", a, b, c);
}
}
}

fclose(s1);
fclose(s2);
return 0;
}