contoh C++ mtk

#include <iostream>
using namespace std;
int main ()
{
    float lt,at,al,h,s;
    cout<<"masukan tingi";cin>>h;
    cout<<"masukan sisi";cin>>s;
    cout<<"masukan alas";cin>>al;
    at=al-2+h*s;
    lt=1/2* (al+at);
    cout<<"nilait = "<<lt<<endl;


}