# C Program to Calculate the Power of a Number

Example on how to calculate the power of a number if the exponent is an integer. Also you will learn to compute the power using pow() function.

To understand this example, you should have the knowledge of following C programming topics:

The program below takes two integers from the user (a base number and an exponent) and calculates the power.

For example: In case of 2^{3}

- 2 is the base number
- 3 is the exponent
- And, the power is equal to 2*2*2

## Example #1: Power of a Number Using while Loop

```
#include <stdio.h>
int main()
{
int base, exponent;
long long result = 1;
printf("Enter a base number: ");
scanf("%d", &base);
printf("Enter an exponent: 4");
scanf("%d", &exponent);
while (exponent != 0)
{
result *= base;
--exponent;
}
printf("Answer = %lld", result);
return 0;
}
```

**Output**

Enter a base number: 3 Enter an exponent: 4 Answer = 81

The above technique works only if the exponent is a positive integer.

If you need to find the power of a number with any real number as an exponent, you can use pow() function.

## Example #2: Power Using pow() Function

```
#include <stdio.h>
#include <math.h>
int main()
{
double base, exponent, result;
printf("Enter a base number: ");
scanf("%lf",&base);
printf("Enter an exponent: ");
scanf("%lf",&exponent);
// calculates the power
result = pow(base,exponent);
printf("%.1lf^%.1lf = %.2lf", base, exponent, result);
return 0;
}
```

**Output**

Enter a base number: 2.3 Enter an exponent: 4.5 2.3^4.5 = 42.44