http://blog.chinaunix.net/uid-26588712-id-3068151.html c++ 数据类型 按照posix标准,一般整型对应的*_t类型为:1字节 uint8_t2字节 uint16_t4字节 uint32_t8字节 uint64_t /* Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. This file is part of
package main import ( "fmt") // pc[i] is the population count of i.var pc [256]byte func init() { for i := range pc { pc[i] = pc[i/2] + byte(i&1) }} func PopCount(x uint64) int { return int(pc[byte(x>>(0*8))] +
// pc[i] is the populatio count of ivar pc [256]byte //统计出o~255每个数对应二进制上1的个数func init() { for i := range pc { pc[i] = pc[i/2] + byte(i&1) // fmt.Printf("i = %d, pc[%d] = %d, pc[%d] = %d, byte(%d&1) = %d\n", i
pecific integral type limits Specifier Common Equivalent Signing Bits Bytes Minimum Value Maximum Value int8_t signed char Signed 8 1 −128 127 uint8_t unsigned char Unsigned 8 1 0 255 int16_t short Signed 16 2 −32,768 32,767 uint16_t unsigned short U
pecific integral type limits Specifier Common Equivalent Signing Bits Bytes Minimum Value Maximum Value int8_t signed char Signed 8 1 −128 127 uint8_t unsigned char Unsigned 8 1 0 255 int16_t short Signed 16 2 −32,768 32,767 uint16_t unsigned short U
uint64 在32位平台 typedef unsigned long long int uint64_t;在64位平台 typedef unsigned long int uint64_t;不同的typdef,要求在printf中使用不同的length modifier,uint64_t 在32位使用ll,在64位使用l.除了定义数据类型,C99还定义了相应数据类型的打印方式,使用PRIu64打印uint64,举例如下: #include <stdio.h> #include <int