#includeint main(){int i;for(i=1;i<5;i++)switch(i){case 1:printf(" A\n");break; //4个空格case 2:printf(" BBB\n");break; //3个空格case 3:printf(" CCCCC\n");break; //2个空格case 4:printf(" DDDDDDD\n"); //1个空格}return 0;}