Method of swapping two variables

The exchange method of two variables in C language

1. The method of establishing temporary variables

#include <stdio.h>
int main(){
    
    
    int a=5;
    int b=3;
    int c=0;
    printf("a=%d,b=%d\n",a,b);
    c=a;
    a=b;
    b=c;
    printf("a=%d,b=%d\n",a,b);
    return 0; 
}

2. The method of not creating temporary variables

2.1 But this method has an overflow problem

#include <stdio.h>
int main(){
    
    
    int a=5;
    int b=3;
    printf("a=%d,b=%d\n",a,b);
    a=a+b;
    b=a-b;
    a=a-b;
    printf("a=%d,b=%d\n",a,b);
    return 0; 
}

2.2 Use the XOR method, but the method is not easy to understand

#include <stdio.h>
int main(){
    
    
    int a=5;
    int b=3;
    printf("a=%d,b=%d\n",a,b);
    a=a^b;
    b=a^b;
    a=a^b;
    printf("a=%d,b=%d\n",a,b);
    return 0; 
}

operation result