My First Project

[nevets04]

Code:

#include <iostream>
using namespace std;

int addition (int a,int b)
{
    int r;
    r=a+b;
    return(r);
}



int subtraction (int a,int b)
{
    int r;
    r=a-b;
    return(r);
}


int multiplication (int a,int b)
{
    int r;
    r=a*b;
    return(r);
}



int division (int a,int b)
{
    int r;
    r=a/b;
    return(r);
}







int main ()
{
    int z;
    int a1;
    int a2;
    int o;
    cout << "First number" << endl;
    cin >> a1;
    cout << "Second number" << endl;
    cin >> a2;
    cout << "1) Addition" << endl;
    cout << "2) Subtraction" << endl;
    cout << "3) Multiplication" << endl;
    cout << "4) Division" << endl;
    cout << "What operation?: ";
    cin >> o;    
    if (o == 1) {    
        z = addition (a1,a2);
    }
    else {    
        if (o == 2) {
            z = subtraction(a1,a2);
        }
        else {
            if (o == 3){
                z = multiplication (a1,a2);
        }
        else {
            if (o ==4){    
                z = division (a1,a2);
            }
        }
    }
}    
    cout << "The result is " << z << endl;
    return 0;
}