C++ Program - Power of a Number
If power (or exponential) of number indicates how many the number is multiplied by itself to get the final number. For example:
x raised to the power 2 = x² = x*x
x raised to the power 3 = x³ = x*x*x
Method 1: Using conditional statement
In the example below, a function called Power() is created to calculate power of a number. It uses while loop to achieve this. This method can be used to calculate the power of a number where power should be a non-negative integer.
#include <iostream> using namespace std; static void Power(double, int); static void Power(double x, int n) { double finalnum = 1; int n1 = n; while(n1 > 0){ finalnum = finalnum * x; n1--; } cout<<x<<" raised to the power "<<n<<" = "<<finalnum<<"\n"; } int main() { Power(3, 5); Power(5, 0); Power(6, 2); return 0; }
The above code will give the following output:
3.0 raised to the power 5 = 243.0 5.0 raised to the power 0 = 1.0 6.0 raised to the power 2 = 36.0
Method 2: Using pow() function of C++ <cmath> header file
The pow() function of C++ <cmath> header file can also be used to calculate power of a number. It can be used to calculate xn for any value of n (n can be negative or fraction).
#include <iostream> #include <cmath> using namespace std; int main() { double x = 3, y = 5, z = 6; double a = 5, b = 0, c = 2; cout<<x<<" raised to the power "<<a<<" = "<<pow(x, a)<<"\n"; cout<<y<<" raised to the power "<<b<<" = "<<pow(y, b)<<"\n"; cout<<z<<" raised to the power "<<c<<" = "<<pow(z, c)<<"\n"; return 0; }
The above code will give the following output:
3.0 raised to the power 5.0 = 243.0 5.0 raised to the power 0.0 = 1.0 6.0 raised to the power 2.0 = 36.0
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