Given the values of two integer variables, the contents of the two values are exchanged (C language)

 

    The first method ：

        Define a temporary variable temp To carry out a and b Value exchange of , The code is as follows ：

 

#include <stdio.h>
int main ()
{
	int a = 5;
	int b = 15;
	int temp = 0;
	printf(" Initial value ： a=%d, b=%d\n",a,b);

	temp = a;//temp=5
	a = b;//a=15
	b = temp;//b=5
	printf(" After exchanging ： a=%d, b=%d\n",a,b);

	return 0;
}

 

 

    

The second method ：

        Do not define temporary variables , By using a and b Difference value （ Other operations can also be used ） swapping , The code is as follows ：

   

#include <stdio.h>
int main ()
{
	int a = 5;
	int b = 15;
	printf(" Initial value ： a=%d, b=%d\n",a,b);

	a = a-b;//a=-10
	b = b+a;//b=5
	a = b-a;//a=15
	printf(" After exchanging ： a=%d, b=%d\n",a,b);

	return 0;
}

The third method ：

        Do not define temporary variables , By XOR （ XOR two binary bits , Same as 0, Dissimilarity is 1） The method of a and b The value of , The code is as follows :

 

#include <stdio.h>
int main ()
{
	int a = 5;
	int b = 15;
	printf(" Initial value ： a=%d, b=%d\n",a,b);

	a ^= b;
	b ^= a;
	a ^= b;
	printf(" After exchanging ： a=%d, b=%d\n",a,b);

	return 0;
}