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How the breadth-first-search run? Can anyone shows me the source code?

Why we are not recommanded to use fflush(stdin)?
What diffecent between gets() and scanf()?

My question is, is it possible to make the font size bigger in DOS mode created by C.

'A' represent 65 in ASCII code, then 'delete' , 'backspace', 'enter', and 'escape' represent what in ASCII...

Is't possible to make the font size bigger in C?
What the 'delete', 'enter', 'escape' and 'backspace' represent by ASCII code?

I write the code to ask the user to enter some information like below:

Enter your name: Kewill
Enter your age: 20

After the user entered his/her name and age, he/she realise that he/she...

Is it possible to make the font size bigger in C?
What is the ASCII code for delete, enter and escape, backspace?

THANK YOU VERY MUCH FOR THOSE WHO GIVE ME THE BIG HELP!!!

What is linked list. Can I have some example?

I have another problem with stack. I want to evaluate a postfix expression and display the result. Below is my code but contain some errors. Anyone can help me?

#include<stdio.h>...

Yes, I want to use stack to convert Base-8 number to decimal.
Below is my code but contain some errors. I tried thousand times already but still can not solve the problem. I hope someone can help me...

Can you briefly describe how the following code
work. I can not understand how it work.

Thank you very much..

#include <stdio.h>
#include <stdlib.h>

static int validate ( char *input )
{

Can u tell me how to convert number to string and then validate it? I just a beginner in C.

THX.

I want to enter a number, but the number cannot contain 8 and 9. How can I do it?
THX.:)