课时练习2

#include<stdio.h>
int main()
{
    char c1,c2,c3,c4;
    scanf("%c%c",&c1,&c2);
    printf("%c %c\n",c1,c2);
    getchar();
    c3 = getchar();
    c4 = getchar();
    printf("%c %c\n",c3,c4);
    printf("%c %c %c %c\n",c1,c2,c3,c4);
    return 0;
}