We'll take two passes through the program's source code. The first pass highlights the meaning of each line, and the second explores specific implications and details.
Figure 2.1 summarizes the parts of a C program; it includes more elements than our first example uses.
#include <stdio.h> ←include another file
This line tells the compiler to include information found in the file stdio.h, which is a standard part of all C compiler packages.
int main(void) ←a function name
C programs consist of one or more functions, the basic modules of a C program. This program consists ...