STL标准模版库

string

• 可以通过printf输出

  string str = "abcd";
  printf("%s\n",str.c_str())

• It can use operator ‘+’ to add two string variable

  stirng str1 = "abc", str2 = "xyz", str3;
  str3 = str1 + str2;

-Two string type variables can be directly compared using ==, <>, and the comparison rule is alphabet order.

stirng str1 = "abc", str2 = "xyz";
if(str2>str1) printf("OK!\n");
// The result is the "OK!" will be print.