How to change background colour in c programming ?

Question

Please help me. If you know then please reply it . And please write the full code to colour background.

Answer 1

This ANSI escape sequence worked for me in my Android terminal*:

#include <cstdio>
int main() {
// 42 = green bg
printf("%c[%dmHELLO!\n", 0x1B, 42);
}

More information on ANSI escape sequences for color here:
https://stackoverflow.com/questions/4842424/list-of-ansi-color-escape-sequences

* [meta] g++ or possibly cppDroid can be used on Android to compile local codes.

Answer 2

Kritikumar Behera [meta / lost knowledge / skippable]

You can write directly to video memory at 0xB800:0000 (the text mode video buffer start address).
The bytes are laid out as text-then-color (or the opposite, I forget), and there's a discussion here:
https://forum.osdev.org/viewtopic.php?f=1&t=16333

and some direct-write code here (I think it writes random colors):
https://gist.github.com/manuj10/3423732
Probably comment line 23 (the shutdown)

Please don't worry too much about it if you want an easier way; this is only for future reference if you are spending research time / serious play.

edit: More info on CPU mode and addressing the buffer:
https://stackoverflow.com/questions/32972051/in-c-how-do-i-write-to-a-particular-memory-location-e-g-video-memory-b800-in

Answer 3

In the first code The function says error . I use turbo c/c++. In the 4th line of program the error says illigal function.