Why this is not working as I expected

Question

I have written a program which will slowly write strings letters.
But it is not working as I expected. There is not any mistake in my program then why it is just printing whole string at a time after mixture of delays.
I'm working in PC not on "SoloLearn Code Play Ground"
https://code.sololearn.com/cfaKkTS7xxWC/?ref=app#c

Answer 1

The largest number you can store in a 4 bytes int is 2^16 = 65536

If you use an unsigned type of 8 bytes you can reach 2^64 that is around 1.8*10^19

edit: it actually is 2^31 not 2^16

Answer 2

Davide Mǟɖ↻ôɖɆⱤ💉
This is not problem at all

Answer 3

Coder Kitten Your answer worked, but what do you mean by flush?
What is use of fflush function?