PENJUMLAHAN

#include <cstdlib>

#include <iostream>

using namespace std;

class jumlah{

friend istream& operator>>(istream&,jumlah&);

friend ostream& operator<<(ostream&,const jumlah&);

public :

jumlah (int a=0,int b=0):x(a),y(b) {}

double hasil();

//   operator double()const;

private:

double x,y;

double jum;

//    void reduce();

};

int main(int argc, char *argv[])

{

int jum;

jumlah a,b;

//jumlah b;

cin>>a;

cin>>b;

cout<<a<<endl;

cout<<b<<endl;

//jum=(a+b);

//    cout<<jum;

system("PAUSE");

return EXIT_SUCCESS;

}

//jumlah::jumlah (int a) {

//x+y;

//            }

//jumlah::operator double(){

//                return double x+y;}

double jumlah::hasil(){

return x+y;}

istream& operator>>(istream& istr,jumlah& p){

cout<<"Masukan Nilai ke-1  : ";istr>>p.x;

cout<<"Masukan Nilai ke-2  : ";istr>>p.y;

cout<<endl;

return istr;

}

ostream& operator<<(ostream& ostr,const jumlah& p){

ostr<<"TOTAL JUMLAH : "<<p.x+p.y<<endl;

ostr<<"TOTAL KURANG : "<<p.x-p.y<<endl;

ostr<<"TOTAL KALI : "<<p.x*p.y<<endl;

ostr<<"TOTAL BAGI : "<<p.x/p.y<<endl;

return ostr;

}

NILAI KE HURUF

#include <cstdlib>

#include <iostream>

using namespace std;

class Nilai{

friend ostream& operator<<(ostream&,Nilai&);

friend istream& operator>>(istream&,Nilai&);

public:

Nilai(){};

void konversikan(){

if((nilai>0)&&(nilai<=20))

nilai_huruf='E';

else if((nilai > 20)&&(nilai<=40))

nilai_huruf='D';

else if((nilai > 40)&&(nilai<=60))

nilai_huruf='C';

else if((nilai>60)&&(nilai<=80))

nilai_huruf='B';

else nilai_huruf='A';

}

private:

int nilai;

char nilai_huruf;

};

istream& operator>>(istream& in,Nilai& masukan){

cout<<"MASUKKAN NILAI = ";

in>>masukan.nilai;

return in;

};

ostream& operator<<(ostream& out,Nilai&keluaran){

out<<"NILAI HURUF = "<<keluaran.nilai_huruf;

return out;

};

int main()

{

Nilai angka;

cin>>angka;

angka.konversikan();

cout<<angka;

system("PAUSE");

return EXIT_SUCCESS;

}

AKAR PERSAMAAN KUADRAT

#include <iostream>

#include <math.h>

#include <conio.h>

using namespace std;

class akar{

friend ostream& operator<<(ostream&, akar&);

friend istream& operator>>(istream&, akar&);

public:

akar();

int disk(){ return B*B-4*A*C;}

float akar1(){ return(-B+sqrt(disk()))/(2*A);}

float akar2(){ return(-B-sqrt(disk()))/(2*A);}

void hitung_akar();

void cetak_disk(){cout<<"DISKRIMINAN = "<<disk()<<endl;}

void cetak_akar(){

cout<<"x1="<<akar1()<<endl;

cout<<"x2="<<akar2()<<endl;

}

private:

int A,B,C;

float x1,x2;

};

ostream& operator<<(ostream& out,akar& keluaran){

keluaran.cetak_disk();

if(keluaran.disk()>=0)keluaran.cetak_akar();

else out<<"AKAR IMAJINER \n";

return out;

}

istream& operator>>(istream& in,akar& masukan){

cout<<"KOEFISIEN PANGKAT 2 = ";in>>masukan.A;

cout<<"KOEFISIEN PANGKAT 1 = ";in>>masukan.B;

cout<<"KOEFISIEN PANGKAT 0 = ";in>>masukan.C;

return in;

}

akar::akar(){

cout<<"MENGHITUNG AKARA PERSAMAAN KUADRAT \n";

}

void akar::hitung_akar(){

if(A==0){

cout<<"BUKAN PERSAMAAN KUADRAT \n";

cout<<"HARGA AKAR = "<<-C/B;} else{

if(disk()>0){

x1=akar1();

x2=akar2();

} else if(disk()==0){

x1=akar1();

x2=x1;

}

}

}

int main(){

akar masalah;

cin>>masalah;

masalah.hitung_akar();

cout<<masalah;

system("PAUSE");

return EXIT_SUCCESS;

}