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With standard input and output that is, from the keyboard and to the screen there are actually two buffers: one for input and one for output. The standard input and output streams are called stdin and stdout respectively. So to identify the input buffer for the keyboard you just use the name stdin. Now that you know how to identify the buffer, how do you remove the information in it Well, there s a standard library function, fflush(), for clearing out buffers. Although this function tends to be used for files, which I ll cover later in the book, it will actually work for any buffer at all. You simply tell the function which stream buffer you want cleared out by passing the name of the stream as the argument. So to clean out the contents of the input buffer, you simply use this statement: fflush(stdin); /* Flush the stdin buffer */

create table test_Employees ( EmployeeID int not null primary key, LastName nvarchar(50) not null, BirthDate datetime null )

Here s the complete program, which includes calculating the scores and flushing the input buffer: /* Program 4.12 Simple Simon */ #include <stdio.h> #include <ctype.h> #include <stdbool.h> #include <stdlib.h> #include <time.h> /* /* /* /* /* For For For For For input and output toupper() function bool, true, false rand() and srand() time() and clock() */ */ */ */ */

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It will also handle errors by simply outputting a node name, rather than running the remote command, if the remote system is unavailable The results listed in Listing 9-13 show that the system named slack is down Listing 9-12 A Script to Run Remote Commands on a Number of Systems #!/bin/bash # Name: ssh_execsh # # Script will take and execute a # remotely on multiple hosts # # Assumptions: 1 $SYSTEM_LIST # specifed as the # 2 You have key # the remote file # # SSH_PATH=/usr/bin REMOTE_USER=root REMOTE_COMMAND=$1 SYSTEM_LIST=$2 REMOTE_USER=$3.

1. Click the Northwind node in Object Explorer. This makes Northwind the context in which you ll execute your SQL. Click New Query. Enter the SQL as in Figure 10-12, then click Execute.

int main(void) { /* Records if another game is to be played */ char another_game = 'Y'; /* true if correct sequence entered, false otherwise */ int correct = false; /* Number of sequences entered successfully int counter = 0; int sequence_length = 0; time_t seed = 0; int number = 0; time_t now = 0; int time_taken = 0; */

/* Number of digits in a sequence */ /* Seed value for random number sequence */ /* Stores an input digit */ /* Stores current time - seed for random values /* Time taken for game in seconds */ */

Since the CREATE TABLE statement specified that EmployeeID is a primary key, SQL Server created test_Employees with a primary key. Refresh the Northwind display in Object Explorer and expand the Columns node for test_Employees. You ll find that EmployeeID is now marked PK, as in Figure 10-13.

Uploading .bashrc to /home/stahnke/.bashrc sftp> stahnke@rack:~> As demonstrated, the sftp session connected and executed all commands placed in the file specified, batch_file. Batching sftp commands is obviously designed for scheduled jobs and scripts. Sometimes using sftp over scp has advantages in scripts because only one connection needs to be established, which is especially nice on slower systems and networks; however, most scripts seem to use scp for its simplicity.

/* Describe how the game is played */ printf("\nTo play Simple Simon, "); printf("watch the screen for a sequence of digits."); printf("\nWatch carefully, as the digits are only displayed" " for a second! "); printf("\nThe computer will remove them, and then prompt you "); printf("to enter the same sequence."); printf("\nWhen you do, you must put spaces between the digits. \n"); printf("\nGood Luck!\nPress Enter to play\n"); scanf("%c", &another_game);

The word function has appeared a few times so far in this chapter with reference to main(), printf(), function body, and so on. Let s explore in a little more depth what functions are and why they re important.

Once a relationship is defined between tables with foreign keys, the key data must be managed to maintain the correct relationships, that is, to enforce referential integrity (RI). RI requires that all foreign key values in a child table either match primary key values in a parent table or (if permitted) be null. This is also known as satisfying a foreign key constraint. As with primary keys, SQL Server doesn t know about foreign keys unless they are explicitly defined.

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