WRITE and WRITELN procedures

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write-procedure = WRITE "(" expression-item { "," expression-item } ")" .
writeln-procedure = WRITELN { "(" expression-item { "," expression-item } ")" } .
expression-item = expression [ ":" width-expression ] .


This is the standard Pascal WRITE and WRITELN procedures that convert an expression to a string and outputs it to the current console (see ASSIGN), with optional width qualifiers.


<expression>:

May be any expression (numeric, char or string) that may be evaluated by the compiler. Single CHAR may be used (they are not converted to BYTE in this case).


<width-expression>:

An optional qualifier (defaults to zero) which specifies the width in characters where the value will be right adjusted; it is evaluated as BYTE: if the evaluation gives a larger value, a byte truncation warning is issued. A zero value means no adjustment.



PMP specificities:


A BOOLEAN expression is written as a BYTE expression (0 or 1).


At the end WRITELN outputs a pair of CR/LF characters, a simple CR or a single LF, according to the $EOL directive.



VAR
 B: byte; C: char;

 WRITE('This is one:', 1 : 3);   // This will output 'This is one:  1'
 B := 3;
 WRITE('This is three:', B);     // This will output 'This is three:3'
 C := '?';
 WRITE('Somebody there', C : 2); // This will output 'Somebody there ?'
 WRITELN; // Output a single CR/LF