选择题：有以下程序： #include"stdio.h" main( ) {char i; for

有以下程序：
#include"stdio.h"
main( )
{char i;
for (; (i=getchar ())!='\n';)
{switch (i-'a')
{case 0: putchar (i);
case 1: putchar (i+1);break;
case 2: putchar (i+2);
case 3: break;
default: putchar (i);break;
}
}
printf ("\n");
}
输入下列数据后，程序的输出结果是____
abcde A abcde
B abcde
C abbde
D abccdd