Question

Write a function to compute the power a^m, where n greaterthanorequalto 0. It should have the following prototype:/* Sets *p to the n' th power of a and returns 0, except * when n < 0 or p is NULL, in which case it returns -1. */int power(int a, int n, int * p); Write a unit test in a main function to test various values. The following code sequence illustrates how to use printf to provide informative output: int x = 3, y = 5, pow; power(x, y, &pow); printf ("%d %d = %d\n", x, y, pow);
C language

Answer 1

#include <stdio.h>
/* Function to find a^n */

int main()
{
int x=2,y=5,pow;
powerOfn(x,y,&pow);
printf("%d ^ %d = %d \n", x , y, pow);
return 0;
}
int powerOfn(int a, int n, int *p)
{
int power=1;
if (n < 0 || !p)
return -1;
while (n > 0)
{
power = power * a;
n=n-1;
}
*p=power;
return 0;
}

C (Gcc-4.9.2) 1 #include<stdio.h> 2 Function to find an / 4 int main() int x-2,y=5,pow; powerOfn (x,y, &pow); printf("%d ^ %d %d return \n", x y, pow); 10 11 int powerOfn(int a, int n, int p) 13 int power-1; 14 if (n < 0111p) 15 16 while (n > 0) 17 18 19 20 21 22 return 23 return-1; powerpower a; n-n-1 p power; 25 26 13:16 Open File Custom Input Run Status Successfully executed Date 2017-02-10 02:56:30 Time 0 sec Mem 2.056 kB Output 2 532