C program to accept length of three sides of a triangle and find out the type of triangle

#include <stdio.h>
#include <conio.h>
int main(){
int s1;
int s2;
int s3;
printf("Enter side 1: ");
scanf("%d", &s1);
printf("Enter side 2: ");
scanf("%d", &s2);
printf("Enter side 3: ");
scanf("%d", &s3);
printf("Triangle is ");
if(s1 == s2 && s1 == s3){
printf("Equilateral");
}else if(s1 == s2 || s2 == s3 || s1 == s3){
printf("Isoscles");
if(s1*s1 == s2*s2 + s3*s3 || s1*s1 == s2*s2 - s3*s3 || s1*s1 == - s2*s2 + s3*s3){
printf(" and is Right Angled");
}
}else{
printf("Scalene");
if(s1*s1 == s2*s2 + s3*s3 || s1*s1 == s2*s2 - s3*s3 || s1*s1 == - s2*s2 + s3*s3){
printf(" and is Right Angled");
}
}
printf(".");
getch();
return 0;
}