right_triangles.c

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

bool rightTriangle(int a, int b, int c) {
  return a*a == b*b + c*c;
}

void printTriangle(int a, int b, int c, bool printed) {
  printf("%s[(%i),(%i),(%i)]", (printed ? "," : ""), a, b, c);
}

int main(int argc, char **argv) {
  int a, b, c;
  bool printed = false;
  
  for (a = 1; a <= 500; a++) {
    for (b = 1; b <= a; b++) {
      for (c = 1; c <= b; c++) {
        if (rightTriangle(a, b, c)) {
          printTriangle(a, b, c, printed);
          printed = true;
        }
      }
    }
  }
  if (printed) {
    printf("\n");
  }
  return(EXIT_SUCCESS);
}