如何将一个64位数字拆分为八个8位值? [英] How to split a 64-bit number into eight 8-bit values?

问题描述

是否有一种简单的方法将一个64位( unsigned long long )变量拆分为八个 int8_t 值?

Is there a simple way to split one 64-bit (unsigned long long) variable into eight int8_t values?

例如:

//1001000100011001100100010001100110010001000110011001000110011111
unsigned long long bigNumber = 10455547548911899039;
int8_t parts[8] = splitULongLong(bigNumber);

parts 类似于:

[0] 10011111

[0] 10011111

[1] 10010001

[1] 10010001

[2] 00011001

[2] 00011001

...

[7] 10010001

[7] 10010001

推荐答案

 {
   uint64_t v= _64bitVariable;
   uint8_t i=0,parts[8]={0};
   do parts[i++]=v&0xFF; while (v>>=8);
 }

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