c++关于string的注意点

1.最好不要string和char数组混用

2.string数组初始化可写为：string mars1[13]={"tret", "jan", "feb", "mar", "apr", "may", "jun", "jly", "aug", "sep", "oct", "nov", "dec"};

3.string类的比较函数s1.compare(t)

4.string不能之间用等号赋值，用assign函数，first.assign(str, 0,3)将str从0开始长度为3的部分赋给first