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Program 2: To use mathematical functions.
                                                                     Output:
                  #include<iostream.h>
                                                                     The nearest integer of number is: -543
                  #include<math.h>
                                                                     The absolute value of number is: 543.429993
                  #include<conio.h>                                  The nearest round down value of number is: -544
                  void main()                                        The remainder is: 1
                  {                                                  The a raised to the power b is: 225
                                                                     The square root of 144 is: 12
                        float number =-543.43;
                                                                     The cosine of angle 45 degree is: 0.525322
                        float a = 15, b = 2;
                                                                     The natural logarithm of the number 10 is: 2.302585
                        int angle = 45;
                        cout<<”The nearest integer of number is: “<<ceil(number);

                        cout<<”\nThe absolute value of number is: “<<fabs(number);
                        cout<<”\nThe nearest round down value of number is:”<<floor(number);
                        cout<<”\nThe remainder is: “<<fmod(a, b);
                        cout<<”\nThe a raised to the power b is: “<<pow(a,b);
                        cout<<”\nThe square root of 144 is: “<<sqrt(144);
                        cout<<”\nThe cosine of angle 45 degree is: “<<cos(angle);

                        cout<<”\nThe natural logarithm of the number 10 is: “<<log(10);
                        getch();
                  }

                      FUNCTIONS OF STDLIB.H HEADER FILE

                  The  stdlib.h  header  file  provides  several  general  purpose  functions  for  dynamic  memory
                  management, random number generation, integer arithmetic, etc. Some of the functions of the
                  stdlib.h header file are:

                   Function Name                     Use                  Example                 Output
                   abs                It returns absolute integral value.  abs(-11)  11
                   abort              It  aborts  the  current  process  abort( )    Abort the current process.

                                      abnormally.
                   div                It returns integral division.       div (38,5) 7 as quotient and 3 as remainder
                   exit               It terminates the calling process.  exit(0)    Exit the program

                  Program 3: To use the functions of stdlib.h header file.
                  #include<iostream.h>
                  #include<stdlib.h>

                  #include<conio.h>
                  void main()
                  {
                  int a;
                  cout<<”Enter a number: “;
                  cin>>a;


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