菜鳥求問：用if單分支選擇語句替換switch語句？if...else呢？

主要是關(guān)于default情況的處理，代碼如下：

/*?Fig.?4.7:?fig04_07.c

Counting?letter?grades?*/

#include?

/*?function?main?begins?program?execution?*/

int?main(?void?)

{

int?grade;?/*?one?grade?*/

int?aCount?=?0;?/*?number?of?As?*/

int?bCount?=?0;?/*?number?of?Bs?*/

int?cCount?=?0;?/*?number?of?Cs?*/

int?dCount?=?0;?/*?number?of?Ds?*/

int?fCount?=?0;?/*?number?of?Fs?*/

printf(??"Enter?the?letter?grades.\n"??);

printf(??"Enter?the?EOF?character?to?end?input.\n"??);

/*?loop?until?user?types?end-of-file?key?sequence?*/

while?(?(?grade?=?getchar()?)?!=?EOF?)?{

/*?determine?which?grade?was?input?*/

switch?(?grade?)?{?/*?switch?nested?in?while?*/

case?'A':?/*?grade?was?uppercase?A?*/

case?'a':?/*?or?lowercase?a?*/

++aCount;?/*?increment?aCount?*/

break;?/*?necessary?to?exit?switch?*/

case?'B':?/*?grade?was?uppercase?B?*/

case?'b':?/*?or?lowercase?b?*/

++bCount;?/*?increment?bCount?*/

break;?/*?exit?switch?*/

case?'C':?/*?grade?was?uppercase?C?*/

case?'c':?/*?or?lowercase?c?*/

++cCount;?/*?increment?cCount?*/

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