C++ Power of operation

m-a-i- · 02-02-2007 03:03PM #1

Hi i was wondering if someone could help me. for the life of me i can't work out how you would use a for loop to calculate one number to the power of another. i know that there is a library in c++ which can do this but i am supposed to use a for loop instead of using that library. If someone could point me in the right direction i would really appreciate

Smellyirishman · 02-02-2007 03:11PM

int power(int num, int n)
{
   int result = num
   loop n times
      result = result * num 
   return result
}

With checks for the power = 0 and such things.

Webmonkey · 02-02-2007 09:10PM

Yeah fairly simple.

int num,power,answer=0;

cout << "Enter number: ";
cin >> num;
cout  <<"\nEnter Power: ";
cin >> power;
for(int k = 0; k < power; k++)
{
    answer += num;
}
cout << "\nAnswer: " << answer;

Mutant_Fruit · 02-02-2007 10:32PM

And now we have another budding CS student who has just learned to copy and paste instead of figuring it out himself. :rolleyes:

You're not really supposed to give full solutions for college problems, especially simpler ones like that

satchmo · 02-02-2007 10:36PM

Well it's probably okay if you give them code that's wrong...

Webmonkey wrote:

answer += num;

Webmonkey · 02-02-2007 11:06PM

Sorry about that should have known better.

Hmm half asleep at the moment now with no compiler but can't see anything wrong with adding num to answer repeately.

Mutant_Fruit · 03-02-2007 01:00AM

Webmonkey wrote:

Sorry about that should have known better.

Hmm half asleep at the moment now with no compiler but can't see anything wrong with adding num to answer repeately.

Well, i think the only person who'll learn anything out of this thread is you, the OP is a lost cause at this stage, he has the code and knows where the problem is in it

When you bring evaluate a ^ b (a to power of b), what do you get as your answer if a is 2 and b is 5? I can tell ya, it's not 12

Webmonkey · 03-02-2007 02:24PM

Just realised my mistake in bed lastnight. I was just doing multiplying by repeating addition my apologies! Not editing my post, OP can have a bash at fixing it.

C++ Power of operation

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