How do I link math library to my compiler in codeblocks?

Question

Screen shot of the build log

It seems that it is not able to locate math library. While compiling this program gives an error:

undefined reference to'pow'

I am completely clueless about this.

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

int main() {
    int number1, temp, number2 = 0, x, count = 0;
    printf ("Enter number: ");
    scanf("%d", &number1);

    x = number1;
    while (number1 > 0)
    {
        temp = number1 % 10;
        number2 = (number2 + temp)*pow(10, count++);
        number1 = number1/10;
    }

    printf("The original number order was: %d\n", x);
    printf("\n");

    printf("The reverse number order is: %d\n", number2);
    return 0;
}

Does this answer your question? [How do I link to a library with Code::Blocks?](https://stackoverflow.com/questions/5862757/how-do-i-link-to-a-library-with-codeblocks) — Krishna Kanth Yenumula, Dec 21 '20 at 15:18

score 4 · Answer 1 · answered Oct 23 '21 at 05:48

You add "libm.a" to your "Link libraries" if you're using the GNU GCC Compiler in a Debian based Linux environment.

Click on "Project"
Click "Build options.."
Click the "Linker settings" tab
Click the "Add" button inder the "Link libraries"
Type in "libm.a" and click "OK"
Click "OK" again (this time on the "Project build options" window)

And make sure you have #include <math.h>

score 3 · Accepted Answer · answered Dec 21 '20 at 16:03

3

You need to link math library while compiling your program like this:

gcc test.c -lm

Here is a good explanation why is it necessary for <math.h>.

answered Dec 21 '20 at 16:03

Sam______

114
7

How do i get to terminal where I can compile like: gcc test.c -lm ? – M K Sundaram Dec 25 '20 at 14:37
What operating system do you use? – Sam______ Dec 28 '20 at 08:18
I am using Ubuntu 20.04. – M K Sundaram Dec 28 '20 at 16:33
1

The terminal is in Ubuntu's application list. You can also type Ctrl-Alt-T to invoke it. – the busybee Dec 28 '20 at 18:59
Thanks. Finally, I am able to run the terminal and get the O/p. – M K Sundaram Dec 29 '20 at 14:52

score 0 · Answer 3 · answered Feb 02 '23 at 18:44

Another way is:

Click on "Settings",
Click on "Compiler",
Click on "Linker settings" tab,
Click on "Add",
Type "libm.a" and "OK",
Click on "OK" and that's all.

You're ready lo link against math library on linux using gcc (Don't forget "#include <math.h>" in your source code).

How do I link math library to my compiler in codeblocks?

3 Answers3