luas

#include <iostream>
using namespace std;

float luas_persegi_panjang(float p, float l){
    return p * l;
}
float luas_segitiga(float a, float t){
    return (a * t / 2);
}
float luas_lingkaran(float r){
    return (3.14 * r * r);
}
float luas_jajargenjang(float alas, float tinggi){
    return (alas * tinggi);
}
float luas_kubus(float s){
    return (6 * s * s);
}

int main(){
    int pilihan;
    float a, t, p, l, r, s;
    cout << "MENU :" << endl;
    cout << "1. Persegi Panjang" << endl;
    cout << "2. Segitiga" << endl;
    cout << "3. Lingkaran" << endl;
    cout << "4. Jajar Genjang" << endl;
    cout << "5. Kubus" << endl;
    cout << "Pilih : "; cin >> pilihan;
    switch(pilihan){
        case 1:
            cout << "Persegi Panjang" << endl;
            cout << "Panjang : "; cin >> p;
            cout << "Lebar   : "; cin >> l;
            cout << "Hasil   : " << luas_persegi_panjang(p, l);
            break;
        case 2:
            cout << "Segitiga" << endl;
            cout << "Alas     : "; cin >> a;
            cout << "Tinggi   : "; cin >> t;
            cout << "Hasil    : " << luas_segitiga(a, t);
            break;
        case 3:
            cout << "Lingkaran" << endl;
            cout << "Jari Jari : "; cin >> r;
            cout << "Hasil     : " << luas_lingkaran(r);
            break;
        case 4:
            cout << "Jajar Genjang" << endl;
            cout << "Alas     : "; cin >> a;
            cout << "Tinggi   : "; cin >> t;
            cout << "Hasil    : " << luas_jajargenjang(a, t);
            break;
        case 5:
            cout << "Kubus" << endl;
            cout << "Sisi     : "; cin >> s;
            cout << "Hasil    : " << luas_kubus(s);
            break;
        default:
            cout << "Pilih Rumus";
            break;
    }
}