/*
 **************************************************************************
 * Program name : 022_Math_Library_Functions (Version 1.00)               *
 * Author       : Duck Wong                                               *
 * Language     : C / C++                                                 *
 * Compiler     : Boodshed Dec-C++ compiler Ver 3.95                      *
 * Computer     : PII350                                                  *
 * O/S          : Windows 98                                              *
 **************************************************************************
 * Version 1.00 : 2000/06/11 - first version                              *
 **************************************************************************
 * Description  : (a) Show the results of using different Math functions  *
 **************************************************************************
*/
#include <iostream.h>
#include <stdlib.h>
#include <Math.h>

int main()
{
 // part 1 : declaration
 float Num_1, Num_2, Num_3;

 // part 2 : Show the result of using different Math functions
 Num_1 = 16.75 ;
 Num_2 = 3.25  ;
 cout << "\nNum_1 = " << Num_1 << "\t\t\tNum_2 = " << Num_2
      << "\n-------------------------------------------------------------"
      << "\nsqrt(Num_1)       = " << sqrt(Num_1)                // Note (1)
      << "\tsqrt(Num_2)       = " << sqrt(Num_2)
      << "\nexp(Num_1)        = " << exp(Num_1)
      << "\texp(Num_2)        = " << exp(Num_2)
      << "\nlog(Num_1)        = " << log(Num_1)
      << "\tlog(Num_2)        = " << log(Num_2)
      << "\nlog10(Num_1)      = " << log10(Num_1)
      << "\tlog10(Num_2)      = " << log10(Num_2)
      << "\nfabs(Num_1)       = " << fabs(Num_1)
      << "\tfabs(-Num_2)      = " << fabs(-Num_2)
      << "\nceil(Num_1)       = " << ceil(Num_1)
      << "\t\tceil(Num_2)       = " << ceil(Num_2)
      << "\nceil(-Num_1)      = " << ceil(-Num_1)
      << "\t\tceil(-Num_2)      = " << ceil(-Num_2)
      << "\nfloor(Num_1)      = " << floor(Num_1)
      << "\t\tfloor(Num_2)      = " << floor(Num_2)
      << "\nfloor(-Num_1)     = " << floor(-Num_1)
      << "\t\tfloor(-Num_2)     = " << floor(-Num_2)
      << "\nfmod(Num_1,Num_2) = " << fmod(Num_1,Num_2)
      << "\t\tfmod(Num_1,Num_2) = " << fmod(Num_1,Num_2)
      << "\n-------------------------------------------------------------"
      << "\npow(floor(Num_1),floor(Num_2))        = "
      << pow(floor(Num_1),floor(Num_2))
      << "\npow(floor(Num_2),sqrt(floor(Num_1)))  = "
      << pow(floor(Num_2),sqrt(floor(Num_1)))
      << "\n-------------------------------------------------------------"
      << "\nNon-standard function : "; endl;
 cout << "\nTruncation of num_1 = ";
 if (Num_1>=0)
   cout << floor(Num_1);
 else cout << ceil(Num_1);
 cout << "\tTruncation of num_2 = ";
 if (Num_2>=0)
   cout << floor(Num_2);
 else cout << ceil(Num_2);
 cout << "\nRounding of num_1   = ";
 if (Num_1>=0)
   cout << floor(Num_1+0.5);
 else cout << ceil(Num_1-0.5);
 cout << "\tRounding of num_2   = ";
 if (Num_2>=0)
   cout << floor(Num_2+0.5);
 else cout << ceil(Num_2-0.5);
 cout << "\n\n" << endl;
  system("PAUSE");
 return 0;
}

/* Notes
   (1) C++                            Pascal
       ---------------------------------------------------------------
       sqrt(Num_1)                    sqrt(Num_1)
       ---------------------------------------------------------------
       Num_1*Num_1                    sqr(Num_1)
       ---------------------------------------------------------------
       log(Num_1)                     ln(Num_1)
       ---------------------------------------------------------------
       log10(Num_1)                   ln(Num_1)/ln(10)
       ---------------------------------------------------------------
       fabs(Num_1)                    abs(Num_1)
       ---------------------------------------------------------------
       fmod(Num_1)                    Num_1-(trunc(Num_1/Num_2))*Num_2
       ---------------------------------------------------------------
       ceil(Num_1)                    if (Num_1 > trunc(Num_1)) then
                                        write (trunc(Num_1)+1)
                                      else write (trunc(Num_1));
       ---------------------------------------------------------------
       floor(Num_1)                   if (Num_1 < trunc(Num_1)) then
                                        write (trunc(Num_1)-1)
                                      else write (trunc(Num_1));
       ---------------------------------------------------------------
       if (Num_1>=0)                  trunc(Num_1)
         cout << floor(Num_1);
       else cout << ceil(Num_1);
       ---------------------------------------------------------------
       if (Num_1>=0)                  round(Num_1)
         cout << floor(Num_1+0.5);
       else cout << ceil(Num_1-0.5);
       ---------------------------------------------------------------
*/