C++ :

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
using namespace std;
int a=10,b=50;
int main(){
    int mul,div,mod; double rdiv;
    cout<<"a: "<<a<<endl;
    a=a+5;
    cout<<"a+5: "<<a<<endl;
    a++;
    cout<<"a++: "<<a<<endl;
    a+=5;
    cout<<"a+=5: "<<a<<endl;
    
    cout<<"b: "<<b<<endl;
    b=b-10;
    cout<<"b-10: "<<b<<endl;
    b--;
    cout<<"b--: "<<b<<endl;
    b-=10;
    cout<<"b-=10: "<<b<<endl;
    
    
//    system("pause");
    return 0;
}