#include <iostream>
#include <cstdlib>

using namespace std;
//start function
int tambah (int a, int b){
    int hasil;
    hasil=a+b;
    return hasil;
}
int kali (int a, int b){
    int hasil;
    hasil=a*b;
    return hasil;
}
float luaslingkaran(float r){
    const float PHI = 3.14;
    float hasil;
    hasil=PHI * r * r;
    return hasil;
}
void banding(int a, int b){
     if(a==b){
     cout<<"Nilai yang dimasukan Sama";
     }
     else if (a>b){
     cout<<"Nilai A lebih besar";
     }
     else if(a<b){
     cout<<"Nilai B lebih besar";
     }
}
int sigma(int n){
    int hasil2,kounter;
    for(kounter=1;kounter<=n;kounter++){
    hasil2=hasil2+kounter;
    }
    return hasil2;
}
int main()
{
    int n,menu,kounter,a,b;
    float r, hasil;
        cout<<"Nilai A = ";cin>>a;                             //Bagus Eko Prasetyo
        cout<<"Nilai B = ";cin>>b;                             //06.2016.1.06628
        hasil=tambah(a, b);
        cout<<"Hasil = "<<hasil<<"\n";

        cout<<"Nilai A = ";cin>>a;
        cout<<"Nilai B = ";cin>>b;
        hasil =kali(a, b);
        cout<<"Hasil = "<<hasil<<"\n";

        char operatorku;
        cout<<"Nilai A = ";cin>>a;
        cout<<"Nilai B = ";cin>>b;
        cout<<"Anda memilih (+) or (*) = ";cin>>operatorku;
                if(operatorku == '+'){
                    hasil = tambah(a, b);
                    cout<<"Hasilnya adalah = "<<hasil;
                }
                else if(operatorku== '*'){
                    hasil = kali(a, b);
                    cout<<"Hasilnya adalah = "<<hasil;
                }
                else {
                    cout<<"\nOutput Tidak ada di pilihan\n";
                }
                cout<<endl;

        cout<<"Masukan Jari Jari Lingkaran = ";cin>>r;
        float (hasil = luaslingkaran(r));
        cout<<"Hasil Luas Lingkaran nya adalah = "<<hasil<<"\n";

        cout<<"Nilai A = ";cin>>a;
        cout<<"Nilai B = ";cin>>b;
        banding(a, b);
        cout<<endl;

        cout<<"Input N = ";cin>>n;
        hasil=sigma(n);
        cout<<"Hasil sigma = "<<hasil;
        cout<<endl;

    return 0;
}