Computer Programming 0455-3391-01

1. Computer Programming0455-3391-01

2. A simple example /* HelloWorld: A simple C program */ #include <stdio.h> int main (void) { printf (“Hello world!\n”); return 0; }

3. A simple example /* HelloWorld: A simple C program */ #include <stdio.h> int main (void) { printf (“Hello world!\n”); return 0; } • This is a comment • comments help explain the program to someone • they are ignored by the computer

4. A simple example /* HelloWorld: A simple C program */ #include <stdio.h> int main (void) { printf (“Hello world!\n”); return 0; } • This is an instruction to the compiler to insert the contents of a file named “stdio.h” into the program • supplies useful information for the compiler

5. A simple example /* HelloWorld: A simple C program */ #include <stdio.h> int main (void) { printf (“Hello world!\n”); return 0; } • This tells the compiler we’re about to define a function, named main • main is a special function; it is where your program starts running

6. A simple example /* HelloWorld: A simple C program */ #include <stdio.h> int main (void) { printf (“Hello world!\n”); return 0; } • This is a C statement • This statement calls a function named printf • It causes the text to be printed on the screen