E=mc2(header iostream)

#include <iostream>
using namespace std;

int main()
{
    int m;
    float c,E;
    c = 89.88;
        cout << "Masukkan Nilai Massa (Kg) : ";
        cin >> m;
        E = m * c * c;
        cout << "E = " << E << " J\n";
    return 0;
}