# Menu-Driven program using Switch-case in C

Prerequisite : Switch Case in C

Problem Statement:
Write a menu-driven program using Switch case to calculate the following:
1. Area of circle
2. Area of square
3. Area of sphere

Also use functions input() and output() to input and display respective values.

 `// C program to illustrate ` `// Menu-Driven program ` `// using Switch-case ` ` `  `#include ` `int` `input(); ` `void` `output(``float``); ` `int` `main() ` `{ ` `    ``float` `result; ` `    ``int` `choice, num; ` `    ``printf``(``"Press 1 to calculate area of circle\n"``); ` `    ``printf``(``"Press 2 to calculate area of square\n"``); ` `    ``printf``(``"Press 3 to calculate area of sphere\n"``); ` `    ``printf``(``"Enter your choice:\n"``); ` `    ``choice = input(); ` `     `  `    ``switch` `(choice) { ` `    ``case` `1: { ` `        ``printf``(``"Enter radius:\n"``); ` `        ``num = input(); ` `        ``result = 3.14 * num * num; ` `        ``printf``(``"Area of sphere="``); ` `        ``output(result); ` `        ``break``; ` `    ``} ` `    ``case` `2: { ` `        ``printf``(``"Enter side of square:\n"``); ` `        ``num = input(); ` `        ``result = num * num; ` `        ``printf``(``"Area of square="``); ` `        ``output(result); ` `        ``break``; ` `    ``} ` `    ``case` `3: { ` `        ``printf``(``"Enter radius:\n"``); ` `        ``num = input(); ` `        ``result = 4 * (3.14 * num * num); ` `        ``printf``(``"Area of sphere="``); ` `        ``output(result); ` `        ``break``; ` `    ``} ` `    ``default``: ` `        ``printf``(``"wrong Input\n"``); ` `    ``} ` `    ``return` `0; ` `} ` `int` `input() ` `{ ` `    ``int` `number; ` `    ``scanf``(``"%d"``, &number); ` `    ``return` `(number); ` `} ` ` `  `void` `output(``float` `number) ` `{ ` `    ``printf``(``"%f"``, number); ` `} `

Output:

```Press 1 to calculate area of circle
Press 2 to calculate area of square
Press 3 to calculate area of sphere
1
5
Area of circle=78.5
```

Related Articles:

My Personal Notes arrow_drop_up Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.