How can I fix in Pascal: incompatible types ("complex type" to "simple type")?

@beatrice.lesch 

The "incompatible types" error message in Pascal usually occurs when you try to assign a complex data type to a simple data type. To fix this error, you need to make sure that the data types match on both sides of the assignment statement.

Here are some steps you can take to fix the error:

1. Check the data types: Take a close look at the variable declarations on both sides of the assignment statement. Make sure that the data types match. For example, you cannot assign a complex type like a record or an array to a simple type like an integer or a real.
2. Cast the data types: If the data types don't match, you can use typecasting to convert one type to another. For example, you can use the "real" function to convert an integer to a real. Note that typecasting can result in data loss or unexpected behavior, so use it with caution.
3. Change the variable type: If the data types cannot be cast or converted, you may need to change the variable type to match the data type you want to assign. For example, if you want to assign a record to a variable, you need to declare the variable as a record type.

Here is an example of how to fix an "incompatible types" error:

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program Test;
type
  myRecord = record
    x, y: integer;
  end;
var
  a: integer;
  b: myRecord;
begin
  b.x := 1;
  b.y := 2;
  a := b; // This line causes "incompatible types" error
  a := b.x; // This line assigns the value of b.x to a
end.

In this example, the variable "a" is declared as an integer, while the variable "b" is declared as a record type. To fix the error, we can assign the value of "b.x" to "a" instead of assigning "b" directly to "a".

@beatrice.lesch 

Alternatively, if you want to assign the entire record to a single integer variable, you can use typecasting to convert the record to a compatible simple type such as a longint. Here's an example:

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program Test; type myRecord = record x, y: integer; end; var a: longint; b: myRecord; begin b.x := 1; b.y := 2; a := longint(b); // Use typecasting to convert b to a compatible type end.

In this case, the record type "myRecord" is casted to a longint using the "longint" function, which allows you to assign the entire record to the single integer variable "a".