《Cracking the Coding Interview》——第17章：普通题——题目4

 1 // 17.4 Find the maximum of two numbers without using comparison operator or if-else statement.
 2 // Use bit operation instead. But this solution applies to integer only.
 3 #include <cstdio>
 4 using namespace std;
 5 
 6 int mymax(int x, int y)
 7 {
 8     static const unsigned mask = 0x80000000;
 9     return (x & mask) ^ (y & mask) ? ((x & mask) ? y : x) : ((x - y & mask) ? y : x);
10 }
11 
12 int main()
13 {
14     int x, y;
15     
16     while (scanf("%d%d", &x, &y) == 2) {
17         printf("%d\n", mymax(x, y));
18     }
19     
20     return 0;
21 }