stdin

I have read about 5-10 different advices how to clear stdin, but none of them suits my needs. The thing is that fflush(stdin) worked perfectly at my computer, but unfortunately it doesn't seem to work everywhere, so I need something with the same functionality. Every other way I tried clears stdin when it is not empty but requires user input when stdin IS empty, which means it requires input in a moment I dont want to get any (+ it discards it anyway). The question is: Can I somehow make sure, that stdin IS empty before I require user input? (and if not, THEN and only then clear it somehow?)

i have a problem with the use of fgets. The loop is supposed to read a line of max. 19 characters, analyze this char array and then wait for next input. The problem is that if the line entered exeeds 19 characters, fgets will fill str with the remaining characters untill Ctrl-D or newline is entered, thus initiating a new loop without new input. The input (stdin) should in some way be flushed after 19 characters are read, so the loop can start with a clean slate. Anyone have a solution to this? char str[20]; while((fgets(str, 20, stdin) != NULL)) { puts(str); //monitoring str if(str[0] == 'q')

A question about this has been asked here End of File (EOF) in C but it still doesn't completely solve my problem. EOF makes sense to me in any datastream which is not stdin , for example if I have some data.txt file, fgetc() will read all the chars and come to the end of file and return -1 . What I don't understand is the concept of EOF in stdin . If I use getchar() , it will wait for me to enter something, so if there is NOTHING written, End of File, ( EOF ) is not returned automatically? So is it that only the user can invoke EOF in stdin by pressing Ctrl + Z ? If so then what are some of

I want to Learn php & mySQL and I purchased a book (php&mySql: the missing manuals 2edition) I installed Wampserver2.4 on win8 64bit machine. Server Configuration Apache Version : 2.4.4 PHP Version : 5.4.12 in first lesson i got this error :( Notice: Use of undefined constant STDIN - assumed 'STDIN' in C:\wamp\www\study\sayHello.php on line 5 this is the php code on file "sayHello.php" <?php echo "Hello there. So I hear you're learning to be a PHP programmer!\n"; echo "Why don't you type in your name for me:\n"; $name = trim(fgets(STDIN)); echo "\nThanks, " . $name . ", it's really nice to

This question already has an answer here: Confused about stdin, stdout and stderr? 10 answers I'm trying to understand stdin stdout and stderr . I see them used in people's code all the time and I can't understand exactly what they are. I am assuming that they have something to do with input/output but have been searching for an explanation online and can't find one. Does anybody know of a good link with an explanation or if it is simple enough to explain it would be a great help to me. Since I am learning Python 3, examples in that would be helpful. sys.stdin sys.stdout sys.stderr File

I'm trying to make a bash script that creates a mysql user and database but I can't find a way to feed the sql into mysql, I'm trying with this format: mysql < echo "query" But that is not working, see the example below: mysql --host=localhost --user=user --password=password < echo "CREATE USER 'testuser'@'localhost' IDENTIFIED BY 'jakdJxct8W'; CREATE DATABASE IF NOT EXISTS 'testuser_dev' DEFAULT CHARACTER SET utf8 COLLATE utf8_bin; GRANT ALL PRIVILEGES ON 'testuser_dev' . * TO 'testuser'@'localhost'; CREATE DATABASE IF NOT EXISTS 'testuser_qa' DEFAULT CHARACTER SET utf8 COLLATE utf8_bin;