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WargaSlowy
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tutorial_cpp
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oop
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#include <iostream>
#include <string>
class Lingkaran {
public:
Lingkaran(double jari, std::string warna) {
jari_jari = jari;
warna_lingkaran = warna;
std::cout << "lingkaran dengan warna: " << warna_lingkaran
<< "dengan jari jari " << jari_jari << " telah terbuat"
<< std::endl;
}
double info_jari_jari() const { return jari_jari; }
std::string info_warna_lingkaran() const { return warna_lingkaran; }
double hitung_luas() const { return 3.14159 * jari_jari * jari_jari; }
friend void tampilin_info_lengkap(const Lingkaran &lingkaran);
friend double hitung_keliling(const Lingkaran &lingkaran);
friend bool apakah_lebih_besar(const Lingkaran &lingkaran_satu,
const Lingkaran &lingkaran_dua);
private:
double jari_jari;
std::string warna_lingkaran;
};
void tampilin_info_lengkap(const Lingkaran &lingkaran) {
std::cout << "warna: " << lingkaran.warna_lingkaran << std::endl;
std::cout << "jari-jari: " << lingkaran.jari_jari << " cm" << std::endl;
std::cout << "luas: " << 3.14159 * lingkaran.jari_jari * lingkaran.jari_jari
<< " cm kuadrat" << std::endl;
}
double hitung_keliling(const Lingkaran &lingkaran) {
return 2 * 3.14159 * lingkaran.jari_jari;
}
bool apakah_lebih_besar(const Lingkaran &lingkaran_satu,
const Lingkaran &lingkaran_dua) {
return lingkaran_satu.jari_jari > lingkaran_dua.jari_jari;
}
int main() {
Lingkaran lingkaran_pertama(3.4, "biru");
Lingkaran lingkaran_kedua(2.7, "kuning");
tampilin_info_lengkap(lingkaran_pertama);
std::cout << "kelilingnya adalah: " << hitung_keliling(lingkaran_pertama)
<< std::endl;
if (apakah_lebih_besar(lingkaran_pertama, lingkaran_kedua)) {
std::cout << "lingkaran pertama lebih besar daripada lingkaran kuning"
<< std::endl;
} else {
std::cout << "lingkaran kuning lebih besar daripada lingkaran biru"
<< std::endl;
}
std::cout << "lingkaran biru > lingkaran kuning: "
<< apakah_lebih_besar(lingkaran_pertama, lingkaran_kedua)
<< std::endl;
return 0;
}
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