# Write a Program to Find Cube of a Number using Functions

By | October 3, 2021

Function in programming languages used to perform specific tasks. The functions increase the reusability of code and make the overall code more modular and readable. In this programming tutorial, we will learn how to find a cube of a number using functions.

## C Program

```#include

//function that will find the cube of a number
int cube(int num)
{
return num* num*num;
}
int main()
{
int num;
printf("Enter a Number: ");
scanf("%d", &num);

printf("The cube of Number %d is %d", num, cube(num));

}```

Output

```Enter a Number: 27
The cube of Number 27 is 19683```

## C++ Program

```#include
using namespace std;

//function that will find the cube of a number
int cube(int num)
{
return num* num*num;
}

int main()
{
int num;
cout<<"Enter a Number: "; cin>>num;

cout<<"The cube of Number "<< num <<" is "<< cube(num);

}```

Output

```Enter a Number: 5
The cube of Number 5 is 125```

## Python Program

```def cube(num):
return num*num*num

num = int(input("Enter a Number: "))

print(f"The cube of Number {num} is {cube(num)}")
```

Output

```Enter a Number: 10
The cube of Number 10 is 1000```

### Complexity Analysis

Time Complexity: O(1), constant time complexity.

Space Complexity: O(1).

## Conclusion

In this Programing tutorial, we learned how to find a cube of a number using user-defined functions. We implement the program in three different programming languages C++, C, and Python.

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