Sambar Server CScript Quick Overview of C

Sambar Server Documentation

CScript Quick Overview of C

The following is a simple C program:


void main()
{
    printf("Hello World\n");
}

When used in an ASP page, the code might look like:

<html><body> <% printf("Hello World!"); %> </body></html>

The result of executing the above ASP page or program is that the characters ``Hello World'' are printed out.

A C program contains functions and variables. The functions specify the tasks to be performed by the program. The ``main'' function establishes the overall logic of the code. It is normally kept short and calls different functions to perform the necessary sub-tasks. All C programs must have a ``main'' function. CScript ASP pages are a bit different; CScript wraps the ASP page in an implicit ``main'' function.

The above code calls printf, an output function from the I/O (input/output) library (a complete list of libraries and their functions can be found in the System Administration Show CScript Functions forms). The printf line prints the message ``Hello World'' on ``stdout'' (the output stream corresponding to the terminal or client browser in which you run the code); ``\n'' prints a ``new line'' character, which brings the cursor onto the next line.

The ``;'' denotes the end of a statement. Blocks of statements are put in braces {...}, as in the definition of functions. All C statements are defined in free format, i.e., with no specified layout or column assignment. Whitespace (tabs or spaces) is never significant, except inside quotes as part of a character string. The following program would produce exactly the same result as our earlier example:

<HTML><BODY>
main(){printf("Hello World\n");}

The following is a slightly longer program that adds three integers and prints their sum.

main() 
{
    int a, b, c, sum;
    a = 1;  
    b = 2;  
    c = 3;
    sum = a + b + c;
    printf("sum is %d\n", sum);
}