1. Write a program to print a welcome msg ": welcome in c++"?


#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

cout<<"\t\t\t\t\tgaurav agarwal"<<endl;

cout<<"welcome in c++";

getch();

}

2. Write a program to enter three numbers to print the sum, multiplication, division?


#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int a,b,sum,div,pdt;

cout<<"\t\t\t\t\tgaurav agarwal"<<endl;

cout<<"enter two no.";

cin>>a>>b;

cout<<"sum"<<a+b;

cout<<"\ndiv"<<a/b;

cout<<"\nmul

"<<a*b;

getch();

}

3. Write a program to swap two numbers using third variable?


#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int a,b,c;

cout<<"\t\t\t\t\tgaurav agarwal"<<endl;

cout<<"enter a &b";

cin>>a>>b;

c=a;

a=b;

b=c;

cout<<a<<"\n"<<b;

getch();

}

4. Write a program to swap two numbers without using third variable?


#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int a,b;

cout<<"\t\t\t\t\tgaurav agarwal"<<endl;

cout<<"enter a &b";

cin>>a>>b;

a=a+b;

b=a-b;

a=a-b;

cout<<a<<"\n"<<b;

getch();

}