C program to calculate power of a given number

Take two integers from the user for base and exponent and calculate the power as explained below.

Example

Consider the following for writing a C program.

• Suppose base =3
• Exponent = 4
• Power=3*3*3*3

Algorithm

Follow the algorithm given below −

Step 1: Declare int and long variables.
Step 2: Enter base value through console.
Step 3: Enter exponent value through console.
Step 4: While loop.
Exponent !=0
   i. Value *=base
   ii. –exponent
Step 5: Print the result.

Example

The following program explains how to calculate power of given number in C language.

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

Output

When the above program is executed, it produces the following result −

Run 1:
Enter a base value:
5
Enter an exponent value: 4
result = 625
Run 2:
Enter a base value:
8
Enter an exponent value: 3
result = 512

Example

If we want to find the power of real numbers, we can use pow function which is a predefined function present in math.h.

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

Output

When the above program is executed, it produces the following result −

Enter a base value: 3.4
Enter an exponent value: 2.3
3.4^2.3 = 16.69