Help to understand this code !

Hi ,
i can't understand this code :

Code:

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#include <stdio.h>
main (){
        int ch;
        do{
                ch = getchar();
                putchar(ch);
        } while(ch != EOF);

}

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1. Why ch type is int and is not char ?
2. Can use other type for ch ?
3. How many chars can store in ch ?

Excuse me for my bad english writing , Thanks in advance .

1. Why ch type is int and is not char ?
Read the manual page for getchar()

2. Can use other type for ch ?
You can try - see what happens.

3. How many chars can store in ch ?
Does it look like an array to you?

Quote:

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3. How many chars can store in ch ?
Does it look like an array to you?

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I tested many input for this code with random length , but work with any length !!

Ah, but how many does it store at the same time?

What system are you running on? If Linux, use gdb to step through the code line by line, all the while 'display'ing the contents of the variable "ch". Pay special attention when you get to the end.

If Windows, use whatever IDE you're using.

It seems all that code does it prints what the user inputs infinitely until the user terminates the program ( Hence the EOF - End of file ). Not sure
what the point would be, but I guess it could be useful if you just want to print what the user puts in.