CODEWITHSUNDEEP
clibm
user3466199
user3466199

Reputation: 21

How to link the libm library in microsoft visual studio 2010

please, could you help me how we link the libm math library in microsoft visual studio 2010,

in order to use some trigonometric function in a c program ?

Upvotes: 0

Views: 5922

Answers (2)

lone gold
lone gold

Reputation: 238

It should only be necessary to put

#include <math.h>

in your program.

The following compiles without error or warning, in a new empty project in VS2010:

#include <stdio.h>
#include <math.h>

int main(){
  double a,b,c;
  char d;
  a = 0.0;
  b = cos(a);
  c = sqrt(b);
  printf("cos(%lf) = %lf, sqrt(cos(%lf)) = %lf\n", a, b, a, c);
  d = getchar();
  return 0;
}

Here is the VS2010 compile output:

1>------ Rebuild All started: Project: test3, Configuration: Debug Win32 ------
1>  source.c
1>  test3.vcxproj -> c:\users\andy\documents\visual studio 2010\Projects\test3\Debug\test3.exe
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========

If I omit #include <math.h> I get this:

1>------ Rebuild All started: Project: test3, Configuration: Debug Win32 ------
1>  source.c
1>c:\users\andy\documents\visual studio 2010\projects\test3\test3\source.c(9): warning C4013: 'cos' undefined; assuming extern returning int
1>c:\users\andy\documents\visual studio 2010\projects\test3\test3\source.c(10): warning C4013: 'sqrt' undefined; assuming extern returning int
1>  test3.vcxproj -> c:\users\andy\documents\visual studio 2010\Projects\test3\Debug\test3.exe
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========

No changes need to be made to the VS2010 libraries that are linked.

There are no red underlines (intellisense errors) either.

Upvotes: 1

Just a HK developer
Just a HK developer

Reputation: 733

I think I know your problem. It is not the linker problem.

It is the header file name. For example, to use math library, you type #include <math.h>. If you type #include <math>, you will get cannot include file error.

Create a Visual C++ project in Visual Studio 2010 as per usual. Use the following to test:

#include <math.h>
#include <iostream>
using namespace std;

int main(void)
{
    double test = 9.0;
    double result = sqrt(test);

    cout << "test = " << test << "   result = " << result << endl;
}

And the result is:

test = 9   result = 3

Hope this helps.

Upvotes: 0

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