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For example:

                      void main()
                      {
                          display(21);
                      }

                 In the above code, we have provided the value for the age parameter in the display( ) function.
                 Let us merge all the codes to create a running program.

                      #include<iostream.h>
                      #include<conio.h>
                                                                                    DOSBox 0.74, Cpu speed: max 100%
                      int display(int age);
                                                                                 Your age is 21 years old.
                      void main()
                      {

                          clrscr();
                          display(21);
                          getch();
                      }
                      int display(int age)

                      {
                          cout<< "Your age is " << age << " years old.";
                          return 0;
                      }
                 Program 1: To calculate the addition, subtraction, multiplication, division and modulus of two

                 numbers using functions.
                 #include<iostream.h>

                 #include<conio.h>
                 int sum(int, int);
                 int sub(int, int);                       DOSBox 0.74, Cpu speed: max 100% cycles, Frames 0, Program:
                 int multi(int, int);                  Enter first number: 8
                 int div(int, int);                    Enter second number: 6
                                                       The sum of two numbers is: 14
                 int mod(int, int);
                                                       The difference of two numbers is: 2
                 void main()                           The product of two numbers is: 48
                                                       The division of two numbers is: 1
                 {
                                                       The remainder after dividing two numbers is: 2
                     int n1, n2;
                                                       _
                     clrscr();

                     cout<<"Enter first number: ";
                     cin>>n1;
                     cout<<"Enter second number: ";
                     cin>>n2;


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                                                                                                Functions in C++
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