Поменять местами значения целых переменных A и B

#include <iostream.h>
 
int main()
{
   int a, b;
 
   cout << "Enter number a:";
   cin >> a;
   cout << "Enter number b:";
   cin >> b;
   cout << "Inserted numbers: a - " << a << ", b - " << b << endl;
   b = b ^ a;
   a = a ^ b;
   b = b ^ a;
   cout << "Numbers after exchange: a - " << a << ", b - " << b << endl;
 
   system("pause");
 
   return 0;
}

void swap (int a, int b)
{
    a += b;
    b = a - b;
    a -= b;
}

a ^= b ^= a ^= b;

tmp = a;
a = b;
b = tmp;

#include <iostream>
 
int main()
{
    int a = 42, b = 24;
 
    a += b;
    b = a - b;
    a -= b;
 
    std::cout << "a = " << a << ", b = " << b << std::endl;
 
    return 0;
}

#include <iostream>
#include <algorithm>
 
using namespace std;
 
int main()
{
  int a = 7 , b = 5;
  
  swap(a,b);
  
  cout << a << endl << b << endl;
  system("pause");
  return 0;    
}

#include <iostream>
#include <algorithm>
 
using namespace std;
 
int main()
{
  int a = 7 , b = 5;
  
  swap(a,b);
  
  cout << a << endl << b << endl;
  system("pause");
  return 0;    
}

#include <iostream>
#include <algorithm>
 
using namespace std;
 
int main()
{
   int a = 7 , b = 5;
   a=a+b;
   b=a-b;
   a=a-b;
   cout << a << endl << b << endl;
   system("pause");
   return 0; 
}

#include <cstdlib>

#include<iostream>      
#include<string>
using namespace std;
int main()
{double a, b;
 
   cout << "Vvedite znachenie a: ";
   cin >> a;
   cout << "Vvedite znachenie b: ";
   cin >> b;
   cout << "Znachenie peremennyh do izmeneni9: a = " << a << ", b = " << b << endl;
   b=b*a; 
   a=b/a; 
   b=b/a; 
   cout << "Znachenie peremennyh posle izmeneni9: a = " << a << ", b = " << b << endl;
 
    return 0;}