The number 3025 has the following characteristic: 30 + 25 = 55 -> 55*55 = 3025. Write a program to obtain all 4-digit numbers with the same characteristic as the number 3025.

#include <stdio.h>

int main(){
  int n, n1, n2, n3, n4, tmp;
  
  for(n=3025; n<=9999; n++){
    n1 = n % 10;
    n2 = (n % 100)/10;
    n3 = (n % 1000)/100;
    n4 = n / 1000;
    tmp = (n1 + n2)*(n1 + n2);
    if(n3 == n4 && tmp == n){
      printf("%d\n", n);
    }
  }
  
  return 0;
}