How to store user input in a variable?

[stmmm]

I am working with a Nucleo-L476RG and I am using PuTTY as an interface using UART. I am trying to use PuTTY to read a numerical value from the user and then store that entered value in a variable. Below is how I am initializing UART to receive user input. As it is right now, if I type a number or letter on my keyboard it will ready the value correctly, but I want to type a 6 digit number and then verify that number against a separate 6 digit number that will already be defined in the code and then see if they match, like a password. How do I use UART to read 6 numerical values and store them in a separate variable?

[Tesla DeLorean]

You'd have to wait on the input of data, collecting characters, constructing a string, and determining how the user terminates that input, with say a RETURN/ENTER key stroke.

You can then take the string and process it with sscanf() or atoi() type commands, or parse it with string commands.