交换奇偶2

#include<stdio.h>
#define st(num) ((num&0xaaaaaaaa)>>1)|((num&0x55555555)<<1)
void stq(int a) {
int c[32] = { 0 };
int q = 0;
do {
c[q] = a % 2;
a = a / 2;
q++;
} while (a != 0);

for (int i = q - 1; i >= 0; i--) {
printf("%d", c[i]);
}
printf("\n");
}
int main() {
int num;
scanf("%d", &num);
int a = st(num);
stq(a);

return 0;
}