Question

How to swap two numbers without third variable in C++

Answer 1

#include <iostream>

int main() {
    int a = 4, b = 8;

    std::cout << "a = " << a << ", b = " << b << "\n";

    a = a * b;    
    b = a / b;    
    a = a / b;    

    std::cout << "a = " << a << ", b = " << b;

    return 0;
}
 
 
 
 
/*
 
run:
 
a = 4, b = 8
a = 8, b = 4
 
*/

 

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Answer 2

#include <iostream>
 
int main() {
    int a = 3, b = 7;
 
    std::cout << "a = " << a << ", b = " << b << "\n";
 
    a = a + b;
    b = a - b;
    a = a - b;
 
    std::cout << "a = " << a << ", b = " << b;
 
    return 0;
}
  
  
  
  
/*
  
run:
  
a = 3, b = 7
a = 7, b = 3
  
*/

 

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