Interview Questions: Maximum, minimum, and variable exchange of two variables

// XK> example

[Question] If ,? :, Switch, and other judgment statements to find the maximum and minimum values of the two given Variables

[Answer] A + B may cause overflow.

The answer below is from 《ProgramThe second edition of the "Employee Interview Guide" obviously has overflow problems. However, this idea is a bit interesting.

Int max = (a + B + ABS (a-B)> 1; int min = (a + B-ABS (a-B)> 1;

This question is purely an odd sex technique and does not make much sense. The Solution Below is better, but a-B may also overflow during the negative number operation!

Int max = A-(a-B)> 31) & (a-B); int min = a + (B-a)> 31) & (B-));

// XK> example

Question: exchange the values stored in two instead of 3rd variables.

[Answer] This is a common tip in programming. The answer below is a good note. The Three ^ = operators are alternately filled with two variable names.

A ^ = B ^ = a ^ = B;