The main teaching programming language, Pascal, is a classic example of structured programming code. For any novice programmer, step-by-step instructions in Pascal help quickly grasp the basics of programming. Compilation of programs in Pascal is simple and clear, which allows you to understand the features of computer programming in a short time. Code instructions clearly demonstrate the sequence of solving the problem.
Necessary
Pascal programming environment
Instructions
Step 1
Any Pascal program uses a set of standard procedures and functions to process information, as well as input and output data to external devices or a screen. These procedures are contained in special libraries that must be connected before use. At the very beginning of the file containing your program code, specify the included libraries with the uses command. So, if you need to display data on the screen, write a line like this: uses crt.
Step 2
The main program code in Pascal is always enclosed between two operators: Begin and End. The Begin statement points to the beginning of the program, and End to the end. Any complete group of expressions, for example, inside a loop or after a condition, is also separated from other code by "begin-end" statements. Pascal syntax requires that any expression in the program code ends with a ";" and only the last ending End is a dot.
Step 3
Before writing the main body of the program, define the variables and types that you will need to use in the algorithm. Variables are defined by the var operator, types - type. Give the variable a unique name and specify the required data type. There are several standard data types in Pascal. The main ones define string (string), character (char) and numeric values (integer, real).
Step 4
Begin the main body of the program with a Begin statement. In the body, step by step describe the algorithm of your task, using compound and conditional operators (begin … end, if), as well as selection or loop operators (case, while).
Step 5
Create your own functions as needed. Put the description of functions in front of the main body of the program. An expression of the form: function My_Func (n: integer, c: integer): boolean means the declaration of a function named My_Func, into which two arguments of type integer are passed. In this case, the function itself is of type boolean and can be true (true) or false (false). After the title of this function, describe the section of its variables var and write the code in the “begin-end” statements. In the main body of the program, call the function by referring to its name. In this case, in parentheses, pass the necessary arguments to the function: My_Func (2, 3).
Step 6
Data input and output during programming in Pascal occurs using standard language functions: read and write. Use them in combination with each other to present the results of the program on the screen. Run the written program for compilation and execution in any environment that supports the Pascal programming language.
