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Power in Mathematics in C++
The power of a number is the times a number is multiplied to itself. Also knows as exponent or indices.
a to the power b is b times a is multiplied by itself b times. 7 to the power 2 is 72 also known as 7 square is valued 49.
Some common power values are −
A number to the power 0 gives 1.
A number to the power 1 gives the same number, as stated some multiplied once is the same.
A number to the negative power is n times division. Example, a -3 = 1/a3 or (1/a)*(1/a)*(1/a)
Now, let’s do some programming based on the concept of power.
In this problem, we are given two numbers N and a. And we have to find whether N is equal to a to the power of some number.
Let’s take an example to understand the problem,
Input − N = 64 , a = 2
Output − Yes
A simple and effective solution will be a recursive division of the number. If it perfectly divides the number till the end the return TRUE otherwise FALSE.
Example
Program to show the implementation of our solution
#include <iostream>
using namespace std;
bool isAPowerNumber(int x, long int y) {
if (x == 1)
return (y == 1);
long int power = 1;
while (power < y)
power *= x;
return (power == y);
}
int main() {
int N = 625 , a = 5;
if(isAPowerNumber(a, N))
cout<<N<<" is a power of "<<a;
else
cout<<N<<" is not power of "<<a;
return 0;
}Output
625 is a power of 5
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