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                所有可用于int和double類型的比較操作符同樣適用于apstring類型。例如,如果想知道兩個字符串是否相等,可以這樣寫: ~~~ if (word == "banana") { cout << "Yes, we have no bananas!" << endl; } ~~~ 另一個有用的比較操作符可以將單詞按字母順序排列。如下: ~~~ if (word < "banana") { cout << "Your word, " << word << ", comes before banana." << endl; } else if (word > "banana") { cout << "Your word, " << word << ", comes after banana." << endl; } else { cout << "Yes, we have no bananas!" << endl; } ~~~ 需要注意的是,apstring類比較大小寫字母的方式和人是不同的。所有的大寫字母都在小寫字母的前面。結果是: ~~~ Your word, Zebra, comes before banana. ~~~ 解決此問題的一個常見方法是,在比較之前將字符串轉換為標準格式,比如全部變成小寫。下一節會介紹如何轉換。 我不會給出更難的問題了,這會讓程序認識到zebras不是水果。
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