这个阶段的我好像很喜欢把玩code。拿到Code会想它是否能够工作。先使用，再Trace，然后总结归纳。
这些都是从Points C中摘录的。现在看来还是觉得这些简短的Code很经典。
|
********************************方法一**************************************
/**//*
** This function returns the number of 1-bits that appeared in
** the argument value.
*/
int
count_one_bits( unsigned value )
...{
int ones;
/**//*
** While the value still has some 1-bits in it ...
*/
for( ones = 0; value != 0; value = value >> 1 )
/**//*
** If the low-order bit is a 1, count it.
*/
if( value % 2 != 0 )
ones = ones + 1;
return ones;
}
**********************************方法二************************************
/**//*
** This function returns the number of 1-bits that appeared in
** the argument value.
*/
int
count_one_bits( unsigned value )
...{
int ones;
/**//*
** While the value still has some 1-bits in it ...
*/
for( ones = 0; value != 0; value >>= 1 )
/**//*
** If the low-order bit is a 1, count it.
*/
if( ( value & 1 ) != 0 )
ones += 1;
return ones;
} |
