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:
- C Programming Operators
- C programming while and do...while Loop
The program below takes two integers from the user (a base number and an exponent) and calculates the power.
For example: In case of 23
- 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: ");
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
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