题解 | #整数与IP地址间的转换#

#include <stdio.h>

int main() {
    unsigned int a[4], b;
    scanf("%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3])      ;
    scanf("%d", &b);
    printf("%u\n", (a[0] << 24) | (a[1] << 16) | (a[2] << 8) | (a[3] << 0));
    printf("%d.%d.%d.%d\n", (b >> 24) & 0xff, (b >> 16) & 0xff, (b >> 8) & 0xff,
           (b >> 0) & 0xff);
    return 0;
}

这题真是坑，要想注意用无符号打印