Invalid operands to binay

[AliMan]

I'm making a function to calculate variance and this is the error that I'm getting.

My code is:

double variance(int totnum, double data[])    {
        int i=0;
        double variance=0, sum=0;
        
        for (i=0;i<totnum;i++)
    {
        sum += pow((data[i] - mean), 2);
    }


    variance = sum/totnum;


    return variance;

}

[whiteflags]

Actually I don't get an error about invalid operands. This is the error:

Error	1	error C2065: 'mean' : undeclared identifier	c:\users\josh2\documents\visual studio 2013\projects\sandbox\sandbox\source.cpp	9	1	sandbox

And that is if the math library is included for pow().

Make sure you've provided a Short, Self Contained, Correct Example.

[AliMan]

Forgot about that one. Well the mean was just a double, so if you initialize that, then you should get the error that I'm getting. And I do have the math.h included.

[whiteflags]

With mean defined and initialized, the code you've pasted compiles for me.

[AliMan]

Thanks man, made me look into something else.