Question

I’m working on a project using an Arduino and as such, I’m reading from a serial port (which sends ints). I need to then write this serial communication to an LCD, which takes a char*.

I need to read several characters from the serial port (two integers) into a string. After both have been received, I then need to clear the string to prepare for the next two characters.

TLDR: How do I append an int to a char*, and then clear the string after it has two characters?

Answer 1

A char is a single character, whereas a char* can be a pointer to a character or a pointer to the first character in a C string, which is an array of chars terminated by a null character.

You can’t use a char to represent an integer longer than 1 digit, so I’m going to assume you did in fact mean char*.

If you have

char buffer[10];

then you can set buffer to a string representing an int n with sprintf

sprintf(buffer, "%d", n);

And when you’re done with it, you can clear the string with

sprintf(buffer, "");

Hope that’s what you were asking for, and good luck!