A C++ program to find whether given triangle is isosceles or not.

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
void main()
{

clrscr();
int a,b,c,angle;
cout<<"\n Enter the three sides=";
cin>>a>>b>>c;

if(a!=b&&b==c)  OR (a==b||b==c||c==a)
{

cout<<"\n Isoceles Triangle.";

}

Else

{

cout<<"\n Given triangle is not a Isoceles Triangle.";

}

Getch();
}

Explanation :

Isosceles property:

•  In an isosceles triangle, two sides are equal in length. (Traditionally, only two sides equal, but sometimes at least two.) An isosceles triangle also has two equal angles: the angles opposite the two equal sides.