Question

write a C++program to inter change two variable with out using third variable​

Answer 1

Answer:

Program 1: Using * and /

Let's see a simple C++ example to swap two numbers without using third variable.

#include <iostream>

using namespace std;

int main()

{

int a=5, b=10;

cout<<"Before swap a= "<<a<<" b= "<<b<<endl;

a=a*b; //a=50 (5*10)

b=a/b; //b=5 (50/10)

a=a/b; //a=10 (50/5)

cout<<"After swap a= "<<a<<" b= "<<b<<endl;

return 0;

}

Output:

Before swap a= 5 b= 10

After swap a= 10 b= 5

Program 2: Using + and -

Let's see another example to swap two numbers using + and -.

#include <iostream>

using namespace std;

int main()

{

int a=5, b=10;

cout<<"Before swap a= "<<a<<" b= "<<b<<endl;

a=a+b; //a=15 (5+10)

b=a-b; //b=5 (15-10)

a=a-b; //a=10 (15-5)

cout<<"After swap a= "<<a<<" b= "<<b<<endl;

return 0;

}

Output:

Before swap a= 5 b= 10

After swap a= 10 b= 5