CODEWITHSUNDEEP
visual-studio-2010cmath
user285372
user285372

Reputation:

#include <cmath>

What is wrong with the code snippet below that VS2010 wouldn't compile it?

int m = sqrt( n );

( I am trying to ascertain whether an integer is prime... )

Upvotes: 0

Views: 3688

Answers (1)

Erik
Erik

Reputation: 91300

You need to pass a specific floating point type to sqrt - there's no integer overload. Use e.g:

long double m = sqrt(static_cast<long double>(n));

As you include cmath not math.h I'm assuming you want c++. For C, you'll need to use e.g:

double m = sqrt((double) n);

The error you get simply means that the compiler cannot automatically select a sqrt function for you - the integer you pass needs to be converted to a floating point type, and the compiler doesn't know which floating point type and sqrt function it should select.

Upvotes: 4

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