text: // 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]);
  
  #ifdef USE_MYMATH
    double outputValue = mysqrt(inputValue);
  #else
    double outputValue = sqrt(inputValue);
  #endif
  
    fprintf(stdout,"The square root of %g is %g\n",
            inputValue, outputValue);
    return 0;
  }
  