【4.8.1】
#include <stdio.h>
int main()
{
char last_name[20];
char first_name[20];
printf("\n请输入您的姓氏:\n");
scanf("%s",first_name);
printf("\n请输入您的名字:\n");
scanf("%s",last_name);
printf("\n您的名字为:%s,%s",last_name ,first_name);
return 0;
}

【4.8.2】
#include <stdio.h>
#include <string.h>
int main ()
{
char first_name[20];
char name[20];
int width;
printf("\n\t请输入您的姓氏:");
scanf("%s",first_name);
printf("\n\t请输入您的名字:");
scanf("%s",name);
printf("\n\t\"%s,%s\"\n\n",name,first_name);
printf("\n\t\"%10s%10s\"\n\n",name,first_name);
printf("\n\t\"%-10s%-10s\"\n\n",name,first_name);