1. #include<iostream>
2. using namespace std;
3. void sum()
4. {
5.     int a, b;
6.     float sum;
7.     cout<<"Enter The number 1: ";
8.     cin>>a;
9.     cout<<"Enter The Number 2: ";
10.     cin>>b;
11.     sum = a+b;
12.     cout<<"Sum: "<<sum;
13. }
14. void sub()
15. {
16.     int a, b;
17.     float sub;
18.     cout<<"Enter The number 1: ";
19.     cin>>a;
20.     cout<<"Enter The Number 2: ";
21.     cin>>b;
22.     sub = a-b;
23.     cout<<"Sub: "<<sub;
24. }
25. void Multiply()
26. {
27.     int a, b;
28.     float multi;
29.     cout<<"Enter The number 1: ";
30.     cin>>a;
31.     cout<<"Enter The Number 2: ";
32.     cin>>b;
33.     multi = a*b;
34.     cout<<"Multiplication:"<<multi;
35. }
36. void div()
37. {
38.     int a, b;
39.     float div;
40.     cout<<"Enter The number 1: ";
41.     cin>>a;
42.     cout<<"Enter The Number 2: ";
43.     cin>>b;
44.     div = a/b;
45.     cout<<"Division:"<<div;
46. }
47. int main()
48. {
49.     int choice;
50.     cout<<"Calculation Application"<<endl;
51.     cout<<"1. For Sum"<<endl;
52.     cout<<"2. For Sub"<<endl;
53.     cout<<"3. For Multiply"<<endl;
54.     cout<<"4. For Div"<<endl;
55.     cout<<"5. For Exit"<<endl;
56.     cin>>choice;
57.     switch(choice)
58.     {
59.     case 1:
60.         sum();
61.         break;
62.     case 2:
63.         sub();
64.         break;
65.     case 3:
66.         Multiply();
67.         break;
68.     case 4:
69.         div();
70.         break;
71.     default:
72.         cout<<"Invalid"<<endl;
73.     }
74.  
75.     return 0;
76. }
77.