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                # C++ 程序:檢查字符是元音還是輔音 > 原文: [https://www.programiz.com/cpp-programming/examples/vowel-consonant](https://www.programiz.com/cpp-programming/examples/vowel-consonant) #### 在此示例中,`if...else`語句用于檢查用戶輸入的字母是元音還是輔音。 要理解此示例,您應該了解以下 [C++ 編程](/cpp-programming "C++ tutorial")主題: * [C++ `if`,`if...else`和嵌套`if...else`](/cpp-programming/if-else) * * * 五個字母 a,e,i,o 和 u 被稱為元音。 除了這 5 個字母外,其他所有字母都是輔音。 該程序假定用戶將始終輸入字母。 * * * ## 示例:手動檢查元音或輔音 ```cpp #include <iostream> using namespace std; int main() { char c; int isLowercaseVowel, isUppercaseVowel; cout << "Enter an alphabet: "; cin >> c; // evaluates to 1 (true) if c is a lowercase vowel isLowercaseVowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'); // evaluates to 1 (true) if c is an uppercase vowel isUppercaseVowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U'); // evaluates to 1 (true) if either isLowercaseVowel or isUppercaseVowel is true if (isLowercaseVowel || isUppercaseVowel) cout << c << " is a vowel."; else cout << c << " is a consonant."; return 0; } ``` **輸出** ```cpp Enter an alphabet: u u is a vowel. ``` 用戶輸入的字符存儲在變量`c`中。 如果`c`是小寫元音,則`isLowerCaseVowel`的計算結果為`true`,而對于其他任何字符,則為`false`。 同樣,如果`c`是大寫元音,則`isUpperCaseVowel`的計算結果為`true`,而對于其他任何字符,則為`false`。 如果`LowerowerVowel`和`isUppercaseVowel`均為`true`,則輸入的字符是元音,如果不是,則該字符是輔音。
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