Ask for advice! When C++ creates a txt file with fstream, how to name the txt file according to the content of a variable in the program?

You can use a variable to store the file name and then pass it to the constructor of fstream.

You can specify the value of this variable as needed.

string str filename = " information . txt "；

Fstream user file (strfile, of stream::out)；);

StrFileName can be assigned as needed. For example:

strFileName = " information

strFileName+= " 1 1 1 . txt "；