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For example:

                 void main()
                 {
                 display(21);
                 }
                 In the preceding line, 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>
                 int display(int age);                                                    Output:
                                                                                          Your age is: 21 years.
                 void main()
                 {
                      display(21);
                      getch();
                 }

                 int display(int age)
                 {
                      cout<<”Your age is: “<< age<<” years.”;
                      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);
                 int multi(int, int);
                 int div(int, int);
                 int mod(int, int);

                 void main()
                 {
                      int n1, n2;
                      cout<<”Enter first number: “;
                      cin>>n1;
                      cout<<”Enter second number: “;

                      cin>>n2;
                      cout<<”The sum of two numbers is: “<<sum(n1, n2)<<”\n”;

                      cout<<”The difference of two numbers is: “<<sub(n1, n2)<<”\n”;



                                                                                               Functions in C++   75
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