Functions

• void functions
  • No input, no output

  • 
    void greeting() {
        cout << "*************************";
        cout << "* Welcome to my program *";
        cout << "*************************";
        return;
    }
           

  • Useful for instructions
  • Greetings
  • Menu choices
• value returning (no parameters)
  • Return a simple value to the calling routine

  • int get_age() {
        int age; 
        cout  <<  "Enter your age " ;
        cin >> age;
    
        return(age);
    }
          

• value parameters
  • Send in a value to use in the function
  • the value is not changed in the calling routine

  • void print_stars(int star_count) {
       int i;
       for (i=0;i<star_count;i++) {
          cout << "*";
       }
       return;
    }
           

• variable parameters
  • This gives us a way to change the value of the parameters we pass
  • This is new, we have not yet done this

  • 
    void get_age(int & age) {
        cout << "Please enter your  age "; 
        cin >> age;
        return();
    }
          

• constant variable parameters
  • This only makes sense when we learn about some additional data structures
  • We will not discuss this type of parameter in this class.