- Rules of basic programming language how to#
- Rules of basic programming language full#
- Rules of basic programming language code#
As you can see in the example above, these variables are declared as Integers. The variable names 'Num1', 'Num2' and 'Sum' in the program are data placeholders which will store whole numbers, not real/floating-point numbers (in fact, during the execution of the program, a runtime error may occur if a decimal number is input). The ' Var' keyword is used to introduce variables in a program to be used later on as temporary data storage elements. A full-stop is never used within the program, except when dealing with records (later topics) and at the end of the program as seen in the example above.
Rules of basic programming language full#
A program in Pascal starts with the reserved word ' Program' (although it is not explicitly required) and ends with ' End', following a full stop (this is required though). In the following program, the computer must prompt the user to enter a number, then the latter is added to the second number input by the user. (Remember: you can copy and paste the program in a text file, save the text file as filename.pas and open it with your compiler (such as Free Pascal). Below is a simple example of a small program.
Rules of basic programming language how to#
There are various restrictions on how to write this statement. You will note how I indent programs.Ī program in Pascal always starts by the reserved word 'Program' following the title of the program.
Rules of basic programming language code#
Indentation also helps with debugging and code presentation. Indentation is a must in writing programs as it makes it easier to read ie. This first program is, what is commonly referred to in programming, as 'indented'. The only difference is: neatness and friendliness.
This program also runs perfectly as the previous one. Now, look at this: Program Lesson1_Program2 begin
Try running this program with and without the 'readln' procedure and notice the difference. If 'readln' is removed from that line, then the message is displayed on the screen without giving any chance for the user to read it and exits! The 'readln' procedure, here is used to pause the program and waits until the user hits the return key. So, to display any message on the screen, you should use 'write' (or 'writeln'). Prepare to learn PASCAL!!' - an introductory message that is displayed to you whenever you are going to learn a new programming language. The program is written only to display the message : 'Hello World. A very simple program is shown below: Program Lesson1_Program1 As you go along with the lessons, you must note what you can do and what you cannot do in writing a Pascal program. The Pascal programming language is a high level language that has its own syntax rules and grammar rules. A natural language has its own grammar rules, spelling and sentence construction. In a program, you must always obey the rules of the language, in our case, the Pascal language. Read the lessons FREE & OFFLINE from the convenience of your phone.
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