50)
#include
#include
using namespace std;
int main(){   
 int a,b,c; 
cout<<"Enter a: "; 
cin>>a; 
 cout<<"Enter b: "; 
 cin>>b; 
cout<<"Enter c: "; 
 cin>>c; 
 if ((a == b) && (b == c)) {     
  cout<<"This triangle is equilateral";     
   } 
 else if (((a == b) & (b != c)) || ((a != b) && (b == c)) || ((b != a) && (c == a))) {       cout<<"This triangle is isosceles\n";     
  cout<<"The perimeter = "<    }
}

51)
#include
#include
using namespace std;
int main(){
int a,b,sum,pro,diff;
cout<<"Enter first number:\n";
cin>>a;
cout<<"Enter second number:\n";
cin>>b;
if (a != b) {   
 sum = a+b;   
 pro = a*b;   
if (pro > sum) {       
 diff = pro-sum;   
    cout<<"Difference between pro and sum = "<     } 
  }
}