C++的字符串变量

1. string的定义和初始化

string str;
string str = "hello";
str = "world";

2. string的用法

• 字符串拷贝： =
• 字符串比较
  • 大于: >
  • 小于: <
  • 等于: ==
  • 不等于: !=
• 字符串的连接： + +=
• 获取字符串中某个字符： []

  3. 示例

  ```cpp

  include

  include //

  include

  using namespace std;

int main(int argc, char const *argv[]) { cout << “————-c 风格字符串” << endl; char str1[36] = “hello”; char str2[36] = “world”; if(strcmp(str1, str2) < 0){ cout << “small str: “ << str1 << endl; }else{ cout << “small str: “ << str2 << endl; }

char str3[36] = {0};
strcpy(str3, str1);
cout << "str3 : " << str3 << endl;
strcat(str1, str2);
cout << "str1 : " << str1 << endl;
cout << "str1[4] : " << str1[4] << endl;
cout << "----------c++ 风格字符串" << endl;
string str11 = "hello";
string str12 = "world";
if(str11 < str12){
    cout << "small str : " << str11 << endl;
}else{
    cout << "small str : " << str12 << endl;
}
string str13;
str13 = str11;
cout << "str13 : " << str13 << endl;
//str11 += str12;
str11 = str11 + str12;
cout << "str11 : " << str11 << endl;
cout << "str11[4] : "  << str11[4] << endl;
return 0;

} ```