きったんの頭_ん中☆

/*
 * pe4.c
 * https://mind.kittttttan.info/c/pe4
 */

/* https://mind.kittttttan.info/c/palindrome */
#include "palindrome.h"

#include <stdio.h>

void pe4(int first, int last) {
  int m, x, y, xy;

  m = 0;
  for (x = first; x < last; ++x) {
    for (y = x; y < last; ++y) {
      xy = x * y;
      if (xy > m && is_palindrome(xy)) {
        m = xy;
      }
    }
  }

  if (m) {
    printf("Max palindrome is %d for x * y (%d <= x,y < %d)\n", m, first, last);
  } else {
    printf("No palindromes are found for x * y (%d <= x,y < %d)\n", first, last);
  }
}

int main(void) {
  int m, n;

  puts("Problem 4:");
  while (1) {
    if (scanf("%d %d", &m, &n) != 2) {
      scanf("%*s");
      puts("Input 2 Numbers.");
    } else {
      if (!m && !n) {
        break;
      }
      pe4(m, n);
    }
  }

  return 0;
}