If neither you nor anybody else could see your program’s output, there would be little use for your program! Ultimately, you have to be able to view the results of a program. C’s primary means for output is the
printf() function. There is no actual command that performs output, but the
printf() function is a part of every C compiler and one of the most-used features of the language.
In a nutshell,
printf() produces output on your screen. As Figure 4.1 shows, ...