The string class introduction

Introduction: The IOS/ANSI C++ standard extends the C++ library by adding the string class, so you can now use string-type variables (called objects in C++)Rather than just storing strings as character arrays, the string class is simpler to use than arrays, and also provides a way to represent groups of strings as a data type.

#To use the string class, the header file string must be included in the program, and the string class is located in the namespace std.

Use string objects in the same way as character arrays, but the class design allows the program to automatically handle the size of the string, so string objects are also safer than arrays

  Assignment, splicing, adding value

You can assign values ​​like normal variables, but arrays cannot

The string class simplifies merging of substrings. You can use the operator + to combine two string objects, and you can use the operator += to append strings toend of string object

Other operations of the string class

Determine the length of the string name.size(), the c++ string object uses the object name and the period operator to indicate which string to use

The output is the same as the character array, but the input of the whole line is somewhat different, which is expressed as getline(cin,str)

  Other forms of string literals (to be added)