Functions in C++

#include<iostream.h>

#include<conio.h>

void dispfun();

void main()

{

clrscr();

dispfun();

dispfun();

getch();

}

void dispfun()

{

cout<<”Demonstration for a function call”<<endl;

return;

}

#include<iostream.h>

#include<conio.h>

int sum(int,int);

int sum(int,int,int);

void main()

{

int fun1,fun2;

clrscr();

fun1=sum(3,4);

fun2=sum(4,5,6);

cout<<”Sum(3,4)=”<<fun1<<endl;

cout<<”Sum(4,5,6)=”<<fun2<<endl;

getch();

}

int sum(int a,int b)

{

return a+b;

}

int sum(int a,int b,int c)

{

return a+b+c;

}

#include<iostream.h>

#include<conio.h>

int sum(int x=10,int y=20,int z=30);

void main()

{

clrscr();

cout<<”Sum()=”<<sum()<<endl;

cout<<”Sum(15)=”<<sum(15)<<endl;

cout<<”Sum(15,25)=”<<sum(15,25)<<endl;

cout<<”Sum(15,25,35)=”<<sum(15,25,35)<<endl;

getch();

}

int sum(int x,int y,int z)

{

return x+y+z;

}