C++中的string::compare的使用
阿新 • • 發佈:2019-01-05
在C++中使用std::string編寫字串相關操作時,我經常使用find方法,其實在有些場景下需要判斷字串是否相同,因而需要使用compare方法。下面是我的測試樣例:
執行截圖//description: 演示String::compare函式的用法,比較兩個字串是否相等? //compile: g++ -g compare_string.cc -o compare_string #include <string> #include <iostream> using namespace std; int main(int argc, char* argv[]) { string str1("green apple"); string str2("red apple"); string str3("apple"); if(str3.compare("apple") == 0) cout << str3 << " is an apple!" << endl; if(str1.compare(str2) !=0) cout << str1 << " is not " << str2 << endl; if(str1.compare(6, 5, "apple") == 0) cout << "still, " << str1 << " is an apple!" << endl; if(str2.compare(str2.size() - 5, 5, "apple") == 0) cout << "and " << str2 << " is also an apple!" << endl; if(str1.compare(6, 5, str2, 4, 5) == 0) cout << "therefore, both are apples!" << endl; return 0; }
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