Swap the values of two arbitrary value variables, such as:
int a=1;
int b=2;
Option 1: Use the method of adding and subtracting variables (used in interviews)
a = a + b;
b = a - b;
a = a - b;
Option 2: Adding and subtracting variables to assign values (used in interviews)
b = (a + b) - (a = b);
Option 3: Realize with the characteristics of XOR (used in interviews)
a = a ^ b;
b = a ^ b;//a ^ b ^ b = a
a = a ^ b;//a ^ b ^ a = b
Option 4: Use third-party variables (used in development)
int c = a;
a = b;
b = c;
In fact, this is a question that can only be used to fool people during an interview, and it doesn't have much practical meaning! First of all, we must emphasize that the variable type must be an integral type, and there is almost no such idiotic question in actual development! What makes people feel even more absurd is that some people don't let you use the third variable in order to add a little bit of mystery, but a lot of logic in actual development is realized by the third variable!
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