c program to find pythagorean triples -

int a,b,n;  printf("input natural number n (n<2,100,000,000) : "); scanf("%d",&n);  for(a=1;a<=100;a++)     for(b=1;b<=100;b++)          if(a<b && a*a + b*b == n*n)         {             printf("(%d, %d, %d)\n",a,b,n);         }         /*else         {             printf("impossible \n");         }           */                  return 0; 

if delete 'else' program runs correctly. want make function can check number has pythagorean numbers or not using 'else' paragraph. when put 'else' paragraph in code, result dizzy.... plz me!!

put braces around nested code blocks.

int a, b, n; int impossible = 1;  printf("input natural number n      (n<2,100,000,000) : "); scanf("%d", &n);  (a = 1; <= 100; a++) {     (b = 1; b <= 100; b++) {          if (a < b && * + b * b == n * n) {             printf("(%d, %d, %d)\n", a, b, n);             impossible = 0;         }     } }  if (impossible == 1) printf("impossible \n");  return 0;