Thread: Scanf and ordinary characters.

Hello to all. I have some particular questions about scanf and how its works.

Assuming that we have the code :

Code:

 

#include<stdio.h>
int main(void)
{
char mychar;
 
printf(" Give a character : ");
scanf("%c" , &mychar);
 
printf(" Your char is : %c" , mychar);
 
return 0;
}

Assuming that we have the INPUT :

Code:

 Give a character:     <- I pushed ENTER 
 Character is:         <- What is here?

Well , ENTER character have been stored into mychar variable?

On the other hand if I have

Code:

 scanf(" %c" , &mychar);

If I give ENTER ( '\n') + A (character) scanf will match ENTER with space ordinary into format string of scanf and then will match A with mychar variable (due to %c conversion specification ??)

Thank you in Advance

Mr. Lnx

Well ,yes this explanation is great .

I think white-space characters are equivalent with new line characters in scanf... is it right?

Mr. Lnx

Originally Posted by grumpy

No. A newline character is one of the characters that are categorised as whitespace. The reverse is not true. There are whitespace characters that are not newlines (such as the space character itself, tab characters, etc).

hmmm but space and whitespace characters are the same thing. Aren't they?

Well , Finally I understand it thank you very much guys.

Scanf is a strong headache sometimes!!!

Have a nice day.

Mr. Lnx

@Mr.lnx for my codeblocks c compiler does gives undefined behaviour when %c specifier is used i think its best to try this %1s and it's going to be best for collecting characters or your " %1s" to skip whitespace characters before input.

Originally Posted by Nyah Check

@Mr.lnx for my codeblocks c compiler does gives undefined behaviour when %c specifier is used i think its best to try this %1s and it's going to be best for collecting characters or your " %1s" to skip whitespace characters before input.

Thank you. I only wanted to understand how scanf works with ordinary characters in its format string . I am reading the book of King simultaneously
On page 46 of C programming a modern approach second edition it is said that scanf reads / matches white space characters from user's input (if input has some of them because it is not necessary) you may mean when you say that scanf discards these white space characters that they don't be printed .