a=7+23=30
b=30-23=7
a=30-7=23
(programul interschimba valorile a si b)
C++
#include <iostream>
using namespace std;
int main()
{
int a, b;
cout<<"a="; cin>>a;
cout<<"b="; cin>>b;
cout<<endl;
a=a+b;
b=a-b;
a=a-b;
cout<<"a="<<a;
cout<<endl;
cout<<"b="<<b;
return 0;
}