Question

How to use reference to variable in function in C++

Answer 1

#include <iostream>
 
void f(int& n) {
	n++;
}

int main() 
{
	int a = 5;
	
	std::cout << a << '\n';	
	
	f(a);
	
	std::cout << a;	
}
      
      
      
      
/*
run:
    
5
6
       
*/

 

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Answer 2

#include <iostream>

void swap(int& a, int& b) {
    int temp = a;
    a = b;
    b = temp;
}

int main()
{
    int x = 7;
    int y = 3; 
    
    swap(x, y);
    
    std::cout << x << " " << y;
}


/*
run:

3 7

*/

 

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