c 2b 2b calculator program using switch case

1#include<iostream>
2using namespace std;
3int calculator(int num1,int num2,int num3);
4int main()
5{
6    //int num1,num2,num3,choice;
7    int a,b,c,choice;
8    cout<<"enter the first number"<<endl;
9    cin>>a;
10    cout<<"enter the second number"<<endl;
11    cin>>b;
12    cout<<"************************"<<endl;
13    cout<<"****Make your choice****"<<endl;
14    cout<<"1.Addition"<<endl;
15    cout<<"2.Subtraction"<<endl;
16    cout<<"3.Multiplication"<<endl;
17    cout<<"4.Division"<<endl;
18    cout<<"************************"<<endl;
19
20    choice=calculator(a,b,c);
21    return 0;
22}
23int calculator(int num1,int num2,int num3)
24{
25
26    int choice;
27    cin>>choice;
28    switch(choice)
29    {
30
31        case 1: cout<<"you have selected Addition"<<endl;
32                num3=num1+num2;
33                cout<<"Addition of two numbers is "<<num3<<endl;
34                break;
35
36        case 2: cout<<"you have selected Subtraction"<<endl;
37                num3=num1-num2;
38                cout<<"Subtraction of two numbers is "<<num3<<endl;
39                break;
40
41        case 3: cout<<"you have selected Multiplication"<<endl;
42                num3=num1*num2;
43                cout<<"Multiplication of two numbers is "<<num3<<endl;
44                break;
45
46        case 4: cout<<"You have selected Division"<<endl;
47                num3=num1/num2;
48                cout<<"Division of two numbers is "<<num3<<endl;
49                break;
50
51        default: cout<<"You have entered wrong choice"<<endl;
52                    break;
53    }
54}
55
56