C Program to Check Triangle is Equilateral Isosceles or Scalene

Write a C Program to Check whether Triangle is an Equilateral Isosceles or Scalene with an example. For example, a, b, and c are sides.

• Equilateral: If all sides are equal, then it is an Equilateral triangle. a= b = c
• Isosceles: If any of the two sides are equal, it is an Isosceles Triangle. a= b or a= c or b = c
• Scalene: If none of the sides are equal, it is a Scalene Triangle. a != b != c

C Program to Check Triangle is Equilateral Isosceles or Scalene Example

This program helps the user to enter all sides of a triangle. Then Program finds whether it is an Equilateral, Isosceles, or Scalene Triangle using Else If.

#include<stdio.h>
 
int main()
{
	int side1, side2, side3;
 
  	printf("\n Please Enter Three Sides of a Triangle : ");
  	scanf("%d%d%d", &side1, &side2, &side3);
  	
  	if(side1 == side2 && side2 == side3)
  	{
  		printf("\n This is an Equilateral Triangle");
 	}
 	else if(side1 == side2 || side2 == side3 || side1 == side3)
 	{
 		printf("\n This is an Isosceles Triangle");
	}
	else
	{
		printf("\n This is a Scalene Triangle");
	}  
 	return 0;
 }

Let me try another value

 Please Enter Three Sides of a Triangle : 60 40 60

 This is an Isosceles Triangle

another one

 Please Enter Three Sides of a Triangle : 60 50 40

 This is a Scalene Triangle