Tutorial Pembuatan Caculator di C++

Ini Scrip pembuatannya.....

1. #include <cstdlib>
2. #include <iostream>
3. using namespace std;
4. int main()
5. {
6.     double num;
7.     double num2;
8.     char choice;
9.     for (;;){
10.      do {
11.     cout<<"Welcome to thejoshcalculator. V1.5\n";
12.     cout<<"Please choose an option by entering the number, press q to quit\n";
13.     cout<<"1 - Addition\n";
14.     cout<<"2 - Subtraction\n";
15.     cout<<"3 - Division\n";
16.     cout<<"4 - Multiplication\n";
17.     cout<<"5 - Help\n";
18.     cout<<"6 - About This Program\n";
19.     cout<<"7 - Updates to this program\n";
20.     cin>>choice;
21.     } while ( choice < '1' || choice > '7' && choice != 'q');
22.     if (choice == 'q') break;
23.     switch (choice) {
24.            case '1':
25.                 cout<<"Please enter a number\n";
26.                 cin>>num;
27.                 cout<<"Another number to be added\n";
28.                 cin>>num2;
29.                 cout<<num + num2;
30.                 cout<<"\n";
31.                 break;
32.            case '2':
33.                 cout<<"Please enter a number\n";
34.                 cin>>num;
35.                 cout<<"Another number to be subtracted\n";
36.                 cin>>num2;
37.                 cout<<num - num2;
38.                 cout<<"\n";
39.                 break;
40.            case '3':
41.                 cout<<"Please enter a number\n";
42.                 cin>>num;
43.                 cout<<"Another one to be divided\n";
44.                 cin>>num2;
45.                 cout<<num / num2;
46.                 cout<<"\n";
47.                 break;
48.            case '4':
49.                 cout<<"Please enter a number\n";
50.                 cin>>num;
51.                 cout<<"Another one to be multiplied\n";
52.                 cin>>num2;
53.                 cout<<num * num2;
54.                 cout<<"\n";
55.                 break;
56.            case '5':
57.                 cout<<"This is a simple calculator made by me - Josh.\n";
58.                 cout<<"To select an option, type the number next to the option and press enter\n";
59.                 cout<<"E.G. for division, you would type 3 and press enter.\n";
60.                 cout<<"\n";
61.                 break;
62.            case '6':
63.                 cout<<"thejoshcalculator, made by Joshua Griggs - Copyright 2007. :)\n";
64.                 cout<<"Feedback would be nice - joshieboy06@hotmail.com also, what programmes\n";
65.                 cout<<"do people need. Please give me ideas for programs. Bye!!\n";
66.                 cout<<"\n";
67.                 break;
68.            case '7':
69.                 cout<<"Updates include:  -double variable instead of int, so that decimals can be used.\n";
70.                 cout<<"                  -do while loop so that you can exit the program yourself\n";
71.                 cout<<"\n";
72.                 break;
73.            default:
74.                     cout<<"That is not an option";
75.                 }
76. }
77. return 0;
78. }