Side of a Right Triangle

Reads three nonzero integer. Determines and prints if they could be the side of a right triangle.

/*
   title: SidesOfARighttriangle
   author: aeriqusyairi
   date: dec30 2011
   
   Note: Right triangle -> c^2 = a^2 + b^2
         Obtuse triangle -> c^2 > a^2 + b^2
         Acute triangle -> c^2 < a^2 + b^2
*/
#include<stdio.h>
#include<stdlib.h>

int main(){
   int a=0,b=0,c=0,swap=0;
   printf("Input 3 integer:\nFirst\n-");
   scanf("%d", &a);
   printf("Second\n-");
   scanf("%d", &b);       
   printf("Third\n-");
   scanf("%d", &c);
   
   if(a > b && a > c){
      swap = c;
      c = a;
      a = swap;     
   }else if(b > a && b > c){
      swap = c;
      c = b;
      b = swap;      
   }
  
   printf("%s\n", c * c == (a * a) + (b * b) ? "Possible side of right triangle.\n" : "Impossible side of right triangle");
   system("pause");
   return 0;
}