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#include<iostream>
using namespace std;
int main()
{
    int a, b, c, d, e, f, g;
    cout<<"program pertukaran nilai 2 variabel"<<endl;
    a=6;
    b=1;
    c=2;
    d=3;
    e=4;
    f=5;
    cout<<"a= "<<a<<endl;
    cout<<"b= "<<b<<endl;
    cout<<"c= "<<c<<endl;
    cout<<"d= "<<d<<endl;
    cout<<"e= "<<e<<endl;
    cout<<"f= "<<f<<endl;
   
    g=a;
    a=b;
    b=c;
    c=d;
    d=e;
    e=f;
    f=g;
   
    cout<<"jadi perubahannya"<<endl;
    cout<<"a= "<<a<<endl;
    cout<<"b= "<<b<<endl;
    cout<<"c= "<<c<<endl;
    cout<<"d= "<<d<<endl;
    cout<<"e= "<<e<<endl;
    cout<<"f= "<<f<<endl;
   
    return 0;
}

#include<iostream>
using namespace std;
int main()
{
    int a, b, c, A, B, C;
    a = b;
    b = a;
    cout<<"Isi variabel sebelum ditukar"<<endl;
    cout<<"isi a= a \n", a;
    cout<<"isi b= b \n", cin>>b;
    c = A;
    a = B;
    b = C;
    cout<<"Isi variabel setelah ditukarkan"<<endl;
    cout<<"isi a= ";
    cin>>a;
    cout<<"isi b= ";
    cin>>b;
  
    return 0;
}

#include <iostream>
#include <string>
#include <windows.h>

using namespace std;
int main()
{int a, b, c, d, e, f, g, h, i, j, k, l;
cout<<"Operasi penjumlahan, pengurangan, perkalian, dan pembagian"<<endl;
cout<<endl;
cout<<"==========================================================="<<endl;
cout<<"nilai pertama     = ";
cin>>a;
cout<<"nilai kedua     = ";
cin>>b;
c=a+b;
cout<<"nilai pertama + nilai kedua = " <<c<<endl;
cout<<"=================================="<<endl;
cout<<"nilai pertama    = ";
cin>>d;
cout<<"nilai kedua    = ";
cin>>e;
f=d-e;
cout<<"nilai pertama - nilai kedua = " <<f<<endl;
cout<<"================================="<<endl;
cout<<"nilai pertama    = ";
cin>>g;
cout<<"nilai kedua    = ";
cin>>h;
i=g*h;
cout<<"nilai pertama * nilai kedua = "<<i<<endl;
cout<<"================================="<<endl;
cout<<"nilai pertama     = ";
cin>>j;
cout<<"nilai kedua     = ";
cin>>k;
l=j/k;
cout<<"nilai pertama / nilai kedua = " <<l<<endl;
cout<<"================================="<<endl;

system("pause");

}

Indikator	Trayek Perubahan Warna	Perubahan Warna
Metil Jingga	2,9 - 4,0	Merah-kuning
Metil merah	4,2 – 6,3	Merah-kuning
Fenolftalein	8,3 – 10,0	Tidak berwarna-merah
Bromtimol biru	6,0 – 7,6	Kuning-biru