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3.4 Interacting with the Operating System

In the programs we have developed so far, we have used C library functions scanf() and printf() to perform the input and output for our programs. These library routines are simply functions that call on the facilities of the operating system to cause data to be the read from the keyboard and written to the screen. In this section we look in more detail at these features of the operating system.

• 3.4.1 Standard Files and EOF
• 3.4.2 Standard Files and Redirection