在C中將大端點(diǎn)轉(zhuǎn)換為小端點(diǎn)[不使用提供的函數(shù)]在C中，我需要編寫(xiě)一個(gè)函數(shù)來(lái)將大端點(diǎn)轉(zhuǎn)換為小端點(diǎn)。我不能使用任何庫(kù)函數(shù)。
3 回答
慕哥9229398
TA貢獻(xiàn)1877條經(jīng)驗(yàn) 獲得超6個(gè)贊
swapped = (num>>8) | (num<<8);
swapped = ((num>>24)&0xff) | // move byte 3 to byte 0 ((num<<8)&0xff0000) | // move byte 1 to byte 2 ((num>>8)&0xff00) | // move byte 2 to byte 1 ((num<<24)&0xff000000); // byte 0 to byte 3
0xdeadbeef0xefbeadde.
慕尼黑8549860
TA貢獻(xiàn)1818條經(jīng)驗(yàn) 獲得超11個(gè)贊
#include <byteswap.h>
__bswap_32 (uint32_t input)
__bswap_16 (uint16_t input)
守著一只汪
TA貢獻(xiàn)1872條經(jīng)驗(yàn) 獲得超4個(gè)贊
#include <stdint.h>//! Byte swap unsigned shortuint16_t swap_uint16( uint16_t val ) {
return (val << 8) | (val >> 8 );}//! Byte swap shortint16_t swap_int16( int16_t val ) {
return (val << 8) | ((val >> 8) & 0xFF);}//! Byte swap unsigned intuint32_t swap_uint32( uint32_t val ){
val = ((val << 8) & 0xFF00FF00 ) | ((val >> 8) & 0xFF00FF );
return (val << 16) | (val >> 16);}//! Byte swap intint32_t swap_int32( int32_t val ){
val = ((val << 8) & 0xFF00FF00) | ((val >> 8) & 0xFF00FF );
return (val << 16) | ((val >> 16) & 0xFFFF);}更新
int64_t swap_int64( int64_t val ){
val = ((val << 8) & 0xFF00FF00FF00FF00ULL ) | ((val >> 8) & 0x00FF00FF00FF00FFULL );
val = ((val << 16) & 0xFFFF0000FFFF0000ULL ) | ((val >> 16) & 0x0000FFFF0000FFFFULL );
return (val << 32) | ((val >> 32) & 0xFFFFFFFFULL);}uint64_t swap_uint64( uint64_t val ){
val = ((val << 8) & 0xFF00FF00FF00FF00ULL ) | ((val >> 8) & 0x00FF00FF00FF00FFULL );
val = ((val << 16) & 0xFFFF0000FFFF0000ULL ) | ((val >> 16) & 0x0000FFFF0000FFFFULL );
return (val << 32) | (val >> 32);}- 3 回答
- 0 關(guān)注
- 725 瀏覽
添加回答
舉報(bào)
0/150
提交
取消