C Program to Calculate Power of a Number

Exponentiation is a mathematical operation, written as bⁿ, involving two numbers, the base b and the exponent n. When n is a positive integer, exponentiation corresponds to repeated multiplication of the base: that is, bⁿ is the product of multiplying n bases

• Using While Loop 
• Through Function 
• Through Recursive Function 
• Using Pointer through Recursive Function

1. Using While Loop:

#include <stdio.h>

main() {

int pow, num,i = 1;

int result = 1;

printf ("Enter a number:");

scanf ("%d", &num);

printf ("Enter the power:");

scanf("%d", &pow);

while(i <= pow) {

result = result * num;

i++; }

printf("%d to the power %d is: %d", num, pow, result);  }

Output:

2. Through Function:

#include<stdio.h>

main() {

int power(int, int, int);

int pow, num;

int result = 1;

printf  ("Enter a number:");

scanf  ("%d", &num);

printf ("Enter the power:");

scanf("%d", &pow);

result = power(pow, num, result);

printf("%d to the power %d is: %d", num, pow, result); }

int power(int pow, int num, int result)  {

int i = 1;

while(i <= pow)  {

result = result * num;

 i++;    }

return result;  }

Output:

3. Through Recursive Function:

#include <stdio.h>

main() {

int power(int, int);

int pow, num;

int result = 1;

printf ("Enter a number:");

scanf ("%d", &num);

printf ("Enter the power:");

scanf("%d", &pow);

result=power(num, pow);

printf("%d to the power %d is: %d", num, pow, result); }

int power(int num, int pow)  {

if(pow == 0)

return 1;

else

return num * power(num, pow-1);  }

Output:

4. Using Pointer through Recursive Function:

#include <stdio.h>

main() {

int power(int *, int *);

int pow, num;

int result = 1;

printf ("Enter a number:");

scanf ("%d", &num);

printf ("Enter the power:");

scanf("%d", &pow);

result=power(&num, &pow);

printf("%d to the power %d is: %d", num, pow, result); }

int power(int *num, int *pow) {

int a;

a = *pow -1;

if(*pow == 0)

return 1;

else

return (*num) * power(num, &a);  }

Output: