Programming Forums > Application Development > C++

cwl157 · Apr 18th, 2006, 10:21 AM

How do i make a number to a power in C++? Like 5^2 5 raised to the power 2.

Infinite Recursion · Apr 18th, 2006, 10:36 AM

The POW function.

http://www.cplusplus.com/ref/cmath/pow.html

King · Apr 18th, 2006, 10:38 AM

#include <math.h>
...
// 5^2
int num = pow (5,2);

EDIT: IR was quicker then me lol

nnxion · Apr 18th, 2006, 10:48 AM

Yeah he was quicker, and in C++ one includes cmath and uses the std namespace.
So:

(Toggle Plain Text)

#include <iostream> // cout and endl
#include <cmath> // pow

using namespace std;

int main()
{
	// 5^2
	double num = pow (5,2);
	cout << num << endl;
	return 0;
}

cwl157 · Apr 18th, 2006, 6:50 PM

thanks everyone

hbe02 · Apr 18th, 2006, 6:57 PM

you could make ur own pow function.. and even fix it up for powers of fractions...

(Toggle Plain Text)

double result = 1;
double number = 5;
for (int i = 0 ; i<2 ; i++)
	{
		result = result*number;
	}
cout<<result<<endl;

EDIT: im just messing around..

DaWei · Apr 18th, 2006, 7:11 PM

:eek:

Apr 18th, 2006, 10:21 AM	#1
cwl157 Professional Programmer Join Date: Feb 2005 Posts: 346 Rep Power: 4	powers in c++ How do i make a number to a power in C++? Like 5^2 5 raised to the power 2.

Apr 18th, 2006, 10:36 AM	#2
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,473 Rep Power: 8	The POW function. http://www.cplusplus.com/ref/cmath/pow.html __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

Apr 18th, 2006, 10:38 AM	#3
King Professional Programmer Join Date: Jan 2006 Location: Ontario, Canada Posts: 380 Rep Power: 3	(Toggle Plain Text) #include <math.h> ... // 5^2 int num = pow (5,2); #include <math.h> ... // 5^2 int num = pow (5,2); EDIT: IR was quicker then me lol __________________ I am Addicted to Linux!

Apr 18th, 2006, 10:48 AM	#4
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	Yeah he was quicker, and in C++ one includes cmath and uses the std namespace. So: (Toggle Plain Text) #include <iostream> // cout and endl #include <cmath> // pow using namespace std; int main() { // 5^2 double num = pow (5,2); cout << num << endl; return 0; } #include <iostream> // cout and endl #include <cmath> // pow using namespace std; int main() { // 5^2 double num = pow (5,2); cout << num << endl; return 0; } __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

Apr 18th, 2006, 6:57 PM	#6
hbe02 Hobbyist Programmer Join Date: Mar 2006 Location: Lebanon Posts: 148 Rep Power: 3	you could make ur own pow function.. and even fix it up for powers of fractions... (Toggle Plain Text) double result = 1; double number = 5; for (int i = 0 ; i<2 ; i++) { result = resultnumber; } cout<<result<<endl; double result = 1; double number = 5; for (int i = 0 ; i<2 ; i++) { result = resultnumber; } cout<<result<<endl; EDIT: im just messing around..

Apr 18th, 2006, 6:50 PM	#5
cwl157 Professional Programmer Join Date: Feb 2005 Posts: 346 Rep Power: 4	thanks everyone

Apr 18th, 2006, 7:11 PM	#7
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	:eek: __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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Programming Forums > Application Development > C++

powers in c++