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C++ Discussion Thread
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Views: 453

May 25th, 2008

stuck

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could someone please check this code and tell me where i went wrong... it always gives the result 1.00000 but as you can see in the for loop it shouldn't be like that.

C++ Syntax (Toggle Plain Text)
#include <cstdio>
int main(void)
{
    int n;
    float s = 0;
    scanf("%d", &n);
    for(int i = 1; i <= n; i++)
            {
            if(i % 2 == 0) s -= 1/(i*i);
            else s += 1/(i*i);    
            }            
    printf("%1.5f", s);
    scanf("\n");
    return 0;
}
#include <cstdio>
int main(void)
{
    int n;
    float s = 0;
    scanf("%d", &n);
    for(int i = 1; i <= n; i++)
            {
            if(i % 2 == 0) s -= 1/(i*i);
            else s += 1/(i*i);    
            }            
    printf("%1.5f", s);
    scanf("\n");
    return 0;
}

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wellibedamned

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May 25th, 2008

Re: stuck

You need to be working with floats on the right-hand side to get floating-point division. Right now you are doing integer divisions.
s -= 1.0/(i*i);

This one gets everyone at least once a year. Hope this helps.

Duoas

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Postaholic

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May 25th, 2008

Re: stuck

Typecasting worked for me

C++ Syntax (Toggle Plain Text)
  if(i % 2 == 0) s -= 1/(float)(i*i);
            else s += 1/(float)(i*i);
  if(i % 2 == 0) s -= 1/(float)(i*i);
            else s += 1/(float)(i*i);

hammerhead

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Posting Whiz in Training

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since May 2006

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May 25th, 2008

Re: stuck

hmm, thanks alot people... i never really did typecasting.. works!

wellibedamned

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