C programming: character in scanf [duplicate]

Answer 1

When you do a scanf() it's taking the value you ask for only.. for example:

scanf("%d",&posothta);

Let's say I enter 5 here. Really, stdin got 2 characters: '5' and '\n' (because I had to hit the enter key and that generates a newline character).

So into posothta goes the 5, but that pesky newline is left sitting there. The next scanf() now is looking for a character, and since the newline character ('\n') is indeed a character, the program doesn't ask questions, it simply picks up that newline and moves on.

Change your code to:

scanf(" %c",&eidos);

Will skip tell scanf() that "I want you to skip any whitespace characters, then grab the next one". To scanf() a white space character includes not only spaces, but newlines as well.

Answer 2

You Need To flash the buffer:

printf("Dwse posothta grammatosimwn: ");
scanf("%d",&posothta);
flushall();
printf("Dwse to eidos grammatoshmou: ");
scanf("%c",&eidos);

flushall() Function:

#include <stdio.h>
int flushall( void );

Description:

The flushall() function clears all buffers associated with input streams, and writes any buffers associated with output streams. A subsequent read operation on an input file causes new data to be read from the associated file or device.

Calling the flushall() function is equivalent to calling the fflush() for all open stream files.

Returns:

The number of open streams. When an output error occurs while writing to a file, the global variable errno is set.