Standard Libraries

There are no intrinsic functions in C

There are standard libraries

One must include header file to make library functions available

Example

      /* Read an angle in degrees and print its cosine. */

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

      int main()
      {
        float angle;

        scanf ("%f", &angle);

        printf ("Cosine = %f\n", cos (angle/180.0 * 3.14));

        return (0);
      }

• functions can be input to printf

• do "man math" to get a list of functions

• useful constants are defined as well

• C shares same library