C Primer Plus4-1

/*4-1．编写一个程序，要求输入名字和姓氏，然后以“名字，姓氏”的格式打印。*/#include<stdio.h>#include<stdlib.h>int main() {     char firstname[10];     char secondname[10];     printf("Please input your firstname and secondname:");     scanf("%s",firstname);     scanf("%s",secondname);     printf("%s,%s\n",firstname,secondname);     system("pause");     return 0; }