本文主要介绍一些会经常使用到的位操作小技巧,希望能对大家有所帮助。
位操作符只适用于整形变量,不适合浮点数变量(本质是由于两者的数据存储类型不同)。
int a = 1;
int b = 2;
a ^= b;
b ^= a;
a ^= b;
printf("a: %d b: %d\n", a, b);
int a = 5;
int count = 0;
while (a) {
a = a&(a - 1); //每次把最低位丢弃,直到a为0.
count++;
}
printf("%d\n", count);
int a = 5;
int count = 0;
while (a+1) {
a = a | (a + 1);
count++;
}
printf("%d\n", count);
int i = -2;
int j = i >> 31;
i = (i ^ j) - j;
printf("%d\n", i);
int i = -2;
i = ~i + 1;
printf("%d\n", i);
int a = 3;
if((a&1) == 1) {
printf("奇数\n");
} else {
printf("偶数\n");
}
int a = 3;
int b = 7;
printf("平均值: %d\n", ((a + b) >> 1));
unsigned GetBits(unsigned x,int p, int n) {
return (x>>(p+1-n)) & ~(~0<}
END
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