Example: math library

• File math.h contains declarations of the standard C math library routines:

  • double sqrt (double x);
  • double sin (double x);
  • double cos (double x);
  • etc. �

• A client program can access the definitions using the appropriate include directive:

  #include <math.h>
  
  /* yield twice the square root of x */
  double sqrt2 (double x) {
  return 2 * sqrt(x);
  
  }

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