Write a C program to input any number from user and find cube of the given number using function. How to find cube of a given number using function in C programming. Write a C function to find cube of a given number.

**Example**

**Input**

Input any number: 5

**Output**

Cube of 5 = 125

## Required knowledge

Basic C programming, Function

Must know - Program to find power of two number

## Declare function to find cube of a number

Cube of a number num is cube = num * num * num. This is easy, but we need to write a separate function for this simple statement.

- First assign a meaningful name to the function i.e. cube().
- The function should accept a number whose cube is be calculated. Hence, function definition is cube(double num).
- Finally, the function should return cube of argument num passed. Hence, return type of function should be double.

After observing above points function declaration looks like double cube(double num);

**Note: ** Instead of taking double as parameter and return type. You can also use int, float or any other integer/fractional types. However, double fits best for the above requirement.

## Program to find cube using function

```
/**
* C program to find cube of any number using function
*/
#include <stdio.h>
/* Function declaration */
double cube(double num);
int main()
{
int num;
double c;
printf("Enter any number: ");
scanf("%d", &num);
c = cube(num);
printf("Cube of %d is %.2f", num, c);
return 0;
}
/**
* Function to find cube of any number
*/
double cube(double num)
{
return (num * num * num);
}
```

**Important note: ** Inside cube() function you can also use a temporary variable to store cube of num. Which is

```
double cube(double num)
{
double c = num * num * num;
return c;
}
```

However, the above approach is not worth. In addition, it increases complexity to declare a useless variable c. Instead we can directly return cube of num as we did in first approach.

**%.2f** prints fractional numbers up to 2 decimal places. You can also use %f, to print fractional numbers up to 6 decimal places (default).

Output

Enter any number: 5 Cube of 5 is 125.00

Happy coding 😉

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