Question

Как программируется на Паскале полное и неполное ветвление?

Answer 1

Например с помощью оператора if:

Неполное if {условие} then do {...}
Полное
if {условие} then do {...}
     else do {в противном случае}

Answer 2

Programming in Pascal: Full and Partial Branching

Pascal is a programming language that supports both full and partial branching. Branching refers to the ability to execute different sections of code based on certain conditions. In Pascal, this is achieved using conditional statements such as `if-then-else` and `case` statements.

Full Branching: Full branching in Pascal allows for the execution of different sections of code based on a condition. The most commonly used construct for full branching in Pascal is the `if-then-else` statement. Here's the general syntax of the `if-then-else` statement in Pascal:

if condition then
  // code to execute if the condition is true
else
  // code to execute if the condition is false

In this construct, the condition is evaluated, and if it is true, the code block following the `then` keyword is executed. If the condition is false, the code block following the `else` keyword is executed. Here's an example:

var
  num: integer;

begin
  num := 10;

if num > 0 then
    writeln('The number is positive.')
  else
    writeln('The number is non-positive.');
end.

In this example, if the value of `num` is greater than 0, the message "The number is positive." will be displayed. Otherwise, the message "The number is non-positive." will be displayed.

Partial Branching: Partial branching in Pascal allows for the execution of different sections of code based on multiple conditions. The most commonly used construct for partial branching in Pascal is the `case` statement. Here's the general syntax of the `case` statement in Pascal:

case expression of
  value1: 
    // code to execute if expression equals value1
  value2: 
    // code to execute if expression equals value2
  ...
  else
    // code to execute if expression does not match any of the values
end;

In this construct, the `expression` is evaluated, and the code block corresponding to the matching value is executed. If none of the values match the expression, the code block following the `else` keyword is executed. Here's an example:

var
  day: integer;

begin
  day := 3;

case day of
    1: writeln('Monday');
    2: writeln('Tuesday');
    3: writeln('Wednesday');
    4: writeln('Thursday');
    5: writeln('Friday');
    6, 7: writeln('Weekend');
    else writeln('Invalid day');
  end;
end.

In this example, the value of `day` is evaluated, and the corresponding message is displayed based on the matching value. If the value of `day` is 3, the message "Wednesday" will be displayed.

These are the basic constructs for full and partial branching in Pascal. By using `if-then-else` and `case` statements, you can control the flow of your program based on different conditions.