Void Function

A function must have a data type when declaring. The data type determines if a function returns a value or not. A function that is declared as void does not return a value and a function that is declared other than void returns a value.

Void Function

A void function is used if the function does not need to return a value after a computation or displaying some strings such as list, menus, options, etc.

Syntax:

void functionname()

{

//body of the function

}

Sample program 1:

           

#include<iostream>

using namespace std;

void myfunction()

{

cout<<"***************************"<<endl

    <<"* This is from a function *"<<endl

    <<"***************************"<<endl;

}

int main()

{

myfunction();

return 0;

}

Sample program 2:

           

#include<iostream>

using namespace std;

void myfunction()

{

cout<<"\t\t\t   JD and D Company"<<endl

    <<"\t\t\t  Salary Computation"<<endl

    <<"\t\t<E>mployee <M>anager <S>upervisor"<<endl;

}

int main()

{

char pos;

myfunction();

cout<<”Position -> “;

cin>>pos;

if(pos ==’e’ || ‘E’)

{

cout<<”You have selected a position of Employee”<<endl;

}

else if(pos ==’m’ || ‘M’)

{

cout<<”You have selected a position of Manager”<<endl;

}

else if(pos ==’s’ || ‘S’)

{

cout<<”You have selected a position of Supervisor”<<endl;

}

return 0;

}