CMake/Tests/Tutorial/Step3/tutorial.cxx

// A simple program that computes the square root of a number
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "TutorialConfig.h"

#ifdef USE_MYMATH
#include "MathFunctions.h"
#endif

int main (int argc, char *argv[])
{
  if (argc < 2)
    {
    fprintf(stdout,"%s Version %d.%d\n",
            argv[0],
            Tutorial_VERSION_MAJOR,
            Tutorial_VERSION_MINOR);
    fprintf(stdout,"Usage: %s number\n",argv[0]);
    return 1;
    }

  double inputValue = atof(argv[1]);
  double outputValue = 0;

  if(inputValue >= 0)
    {
#ifdef USE_MYMATH
    outputValue = mysqrt(inputValue);
#else
    outputValue = sqrt(inputValue);
#endif
    }

  fprintf(stdout,"The square root of %g is %g\n",
          inputValue, outputValue);
  return 0;
}