I want to store a value even after my program ends

问题:

I want to store a letter into a variable so that whenever the program starts again it can use the variable in further program execution.

What is the way to achieve this?

回答1:

No, you cannot achieve this using variables. variables only exist untill the program finishes execution. Once the program is finished, no variable is retained.

You need to make use of file i/o. You can write the end (final) data of one execution to a file, the next time program runs, it can read the file contains and resume the exection.

For your reference,

In C

you can check below library functions

• fopen()
• fclose()
• fread()
• fwrite()
• fprintf()
• fgets()

and their families.

In C++

• <fstream>