Question

c语言问题： 谁能帮我解释一下下面的程序是完成什么任务的、？谢谢了

#include <stdio.h>

int mystery( unsigned bits ); /* prototype */

int main( void )
{
unsigned x; /* x will hold an integer entered by the user */

printf( "Enter an integer: " );
scanf( "%u", &x );

printf( "The result is %d\n", mystery( x ) );

return 0; /* indicates successful termination */
} /* end main */

/* What does this function do? */
int mystery( unsigned bits )
{
unsigned i; /* counter */
unsigned mask = 1 << 31; /* initialize mask */
unsigned total = 0; /* initialize total */

for ( i = 1; i <= 32; i++, bits <<= 1 ) {

if ( ( bits & mask ) == mask ) {
total++;
} /* end if */

} /* end for */

return !( total % 2 ) ? 1 : 0;
} /* end function mystery */

Answer 1

输入整型数，判断该数的二进制码是含有奇数个1还是偶数个1

Answer 2

这个程式是用来解掩码的，画下草稿，按下计算器，你就明白了，没什么实际意义，我觉得。

Answer 3

楼上正解，返回1表示奇数个1，0表示偶数个1。