题解 | #整数与IP地址间的转换#

#include <stdio.h>
typedef struct{
    unsigned char n1;
    unsigned char n2;
    unsigned char n3;
    unsigned char n4;
}IP_BYTE;
typedef union{
    unsigned int num;
    IP_BYTE ip_byte;
}IP_DATA;


int main() {

    int a1;
    int a2;
    int a3;
    int a4;
    IP_DATA ipA;
    IP_DATA ipB;

    scanf("%d.%d.%d.%d",&a1,&a2,&a3,&a4);
    ipA.ip_byte.n4 = a1;
    ipA.ip_byte.n3 = a2;
    ipA.ip_byte.n2 = a3;
    ipA.ip_byte.n1 = a4;
    printf("%ld\n",ipA.num);
    scanf("%d",&(ipB.num));
    printf("%d.%d.%d.%d",ipB.ip_byte.n4,ipB.ip_byte.n3,ipB.ip_byte.n2,ipB.ip_byte.n1);

    return 0;
}