power function

[nasser]

i want to write a code that calculate
1^1+2^2+3^3....10^10
but it gives a weird answer

  #include<iostream>
using namespace std;
int main()
{
	int sum=0;
	for(int n=1;n<=10;n++) //which 'n' is the base
	{
		for(int p=1;p<=10;p++) //which 'p' is the power
		{
			sum=sum+(int) pow((float)n,p);
		}

	}
	cout<<sum<<endl;
	system("pause");
	return 0;
}

[Ganado]

Why are you using a nested for loop? You might be overthinking it, I can only see you needing one. You're currently doing some 100 times when it seems you only want to summation from 1 to 10 of i^i.
( http://www.wolframalpha.com/input/?i=summation+from+i%3D1+to+10+of+i^i )

#include <cmath>
long sum = 0L;
for (int i = 1; i <= 10; i++)
{
    sum = sum + std::pow(i, i);
}

Didn't compile it though, hope that helps. Add the casting in as needed, you might not need the (float) with C++11.

[nasser]

LOL it's a good to make it i^i i wasn't focus thx alot
but i'm using Vc++ 2010 express and i need to write power in this way

sum=sum+(int) pow((double)n,p);

but it gives me the result with -
(i have stopped C++ for a year and i make this simple codes just to remember i think i need to review it again )
thx alot
and could u tell me which compilers r able to compile C++11

[Ganado]

Oh that's due to overflow errors. int or long isn't guaranteed to be enough because you're dealing 10,000,000,000-something.

Here's working code for me.

#include <iostream>
#include <cmath>
int main()
{
    long long sum = 0LL;
    for (int i = 1; i <= 10; i++)
    {
        sum = sum + std::pow(i, i);
    }
    std::cout << sum << std::endl;
    return 0;
}

It gives same result as wolfram alpha.

____________________________
c++11 stuff:
I was able to compile this fine without C++11, but your compiler should have a flag

-std=c++11

You should be having C++11, there's really no reason not to in 2014, but it isn't the source of your problem anyway.
Edit: Oh I didn't see you're saying you're using VS2010, I'm not sure about the compiler used in that IDE. See if my code compiles correctly. If VS2010 hasn't been updated since 2010, then it's going to be outdated. Why not VS2013?