Untitled

#include <iostream>
#include <math.h>
using namespace std;

class Shapes{
    public: 
    float area_Triangle(int side_1, int side_2, int side_3){
        float s_ = (side_1 + side_2 + side_3)/3;
        return pow((s_*(s_-side_1)*(s_-side_2)*(s_-side_3)),.5); 
    }
    public:
    float area_Trapezium(int side_1, int side_2, int side_height){
        return ((side_1 + side_2)*side_height)/2;
    }
    public: 
    float area_Square(int side){
        return side*side;
    }
    public:
    int area_Rhombus(int diagonal_1, int diagonal_2){
        return (diagonal_1 * diagonal_2)/2;
    }
};

int main()
{
    Shapes ob;
    cout<<"<<<<<<<<<<<<< WELCOME TO THE WORLD OF GEOMETRICS >>>>>>>>>>>>>>"<<endl;
    cout<<"<<<<<<<<<<<<< |||||||||||||||||||||||||||||||||| >>>>>>>>>>>>>>"<<endl;
    cout<<"<============= CALCULATE THE AREAS OF THE BELOW MENTIONED SHAPES ============>"<<endl;
    cout<<"1_ Triangle"<<endl;
    cout<<"2_ Square" <<endl;
    cout<<"3_ Trapezium"<<endl;
    cout<<"4_ Rhombus"<<endl;
    int choice;
    cout<<"<< Enter you choice >>\n";
    cin>>choice;
    float output;
    switch(choice){
        case 1: 
        cout<<"<<<<<<<<<<<<< Enter the 3 sides of the Triangle >>>>>>>>>>>>>>>"<<endl;
        int s1, s2, s3;
        cin>>s1>>s2>>s3;
        output = ob.area_Triangle(s1,s2,s3);
        break;
        case 2:
        cout<<"<<<<<<<<<<<<< Enter the 2 parallel sides of the Trapezium >>>>>>>>>>>>>>>"<<endl;
        int a, b,h;
        cin>>a>>b;
        cout<<"<<<<<<<<<<<<< Enter the height of the Trapezium >>>>>>>>>>>>>>>"<<endl;
        cin>>h;
        output = ob.area_Trapezium(a,b,h);
        break;
        case 3:
        cout<<"<<<<<<<<<<<<< Enter side of the Square >>>>>>>>>>>>>>>"<<endl;
        int s;
        cin>>s;
        output = ob.area_Square(s);
        break;
        case 4:
        cout<<"<<<<<<<<<<<<< Enter the diagonals of the Rhombus >>>>>>>>>>>>>>>"<<endl;
        int d1, d2;
        cin>>d1>>d2;
        output = ob.area_Rhombus(d1,d2);
        break;
        default:
        cout<<"!!!!!!!!!!!!!!!!!!!!! WRONG CHOICE  !!!!!!!!!!!!!!!!!!!!!" <<endl;
        break;
    }
    cout<<"Area is : "<<output;
    return 0;
}