Chapter I.

1. The binary code that the computer can directly identify and accept is called machine instruction----(set) machine language.

2. Output C

#include <stdio.h>int main () {   printf ("This is a C program.\n");   return 0;             }

3. Keyboard input

#include <stdio.h>int main () {int max (int x, int  y), int  A, B, C,  scanf ("%d,%d", &a,&b), C = max ( A, B);p rintf ("max =%d\n", c); return 0;} The  max function for the larger of the two integers, int max (int x, int y) {int z; if (x>y) z = x; elsez = y;
return z;}

4. Structural features of C language programs

1) A program consists of one or more source files

1. Preprocessing commands

2. Global Declaration

3. Function definition

2) function is the main part of C program

3) A function consists of two parts

1. The first part of the function, such as int main ();

2. Function body

1. Declarations section

2. Executive Section

4) The program always executes from the main function

5) The operation of the computer in the program is done by the C statement in the function

6) There must be a semicolon at the end of each data declaration and statement

7) The C language itself does not provide input and output statements

8) The program should contain comments

　

Chapter I.