Write a Program in C to evaluate raised to the power

/*Using While Loop*/

#include<stdio.h>

void main()

{

    int a, b, i, p;

    printf("Enter value of a: ");

    scanf("%d",&a);

    printf("Enter value of b: ");

    scanf("%d",&b);

    p=1;

    i=1;

    while(i<=b)

    {

        p = p * a;

        i++;

    }

    printf("%d to the power %d is : %d",a,b,p);

}

/*Using For Loop*/

#include<stdio.h>

void main()

{

    int a, b, i, p;

    printf("Enter value of a: ");

    scanf("%d",&a);

    printf("Enter value of b: ");

    scanf("%d",&b);   

    p=1;

    for(i=1;i<=b;i++)

        p = p * a;

    printf("%d to the power %d is : %d",a,b,p);

}

/* Using Function */

#include <stdio.h>

#include <conio.h>

double power(int, int);/*PROTOTYPE*/

void main( )

{

 int x,y;

 printf("Enter value of a: ");

    scanf("%d",&x);

    printf("Enter value of b: ");

    scanf("%d",&y);

 printf("%d to the power %d is : %f\n", x,y,power (x,y));

 getch();

}


double power (int x, int y) /*FUNCTION DEFINITION*/

{

 double p;

 p = 1.0 ;     /* X to the power 0 */


 if(y >=0)

   while(y--)   /* positive powers */

     p *= x;

 else

   while (y++)  /* negative powers */

     p /= x;

 return(p);   /* returns double type */

}