WRITELN - write an output line of text.

Usage:

writeln(f,expr);

Where:

f: is a file variable with the type "text". If this argument is omitted, the default output unit "output" is used.
expr: is an expression whose value is "char", "integer", "real", "boolean", or "packed array of char". If an output expression is omitted, "writeln" simply writes a new-line character to "f".

Description:

The "writeln" procedure writes the value of an expression to an output text file. After the expression, it writes a new-line character to show the end of the output line.

If "expr" has the type "char", the single character result will be written.
If "expr" has the type "integer", "writeln" will write the integer as a string of ASCII digits (possibly with a leading sign).
If "expr" has the type "real", "writeln" will write the number in its ASCII form (usually using scientific notation, but exceptions are noted below).
If "expr" has the type "packed array [1..N] of char", "writeln" will write the string in its entirety.
If "expr" has the type "boolean", "writeln" will write the word TRUE or FALSE, as appropriate.

Output expressions may be followed with field widths of the form ":M" where M is a strictly positive integer, as in

writeln(f,i:5);

This construct is called a "field width" and gives the minimum number of characters that should be used when outputting the expression's value. If the expression is "char", "integer", "boolean" or "real", the output will be padded on the left with blanks, if necessary. If the expression is "packed array of char", the string will be padded on the right with trailing blanks.

In addition to a field width, real expressions may have a "precision". This is written as ":N" where N is a strictly positive integer, as in

writeln(f,r:7:2);

The integer N indicates how many significant digits should be displayed following the real number's decimal point.

The form

writeln(f,exp1,exp2,exp3,...,expN);

is equivalent to

write(f,exp1);
write(f,exp2);
   ...
writeln(f,expN);

Examples:

a := 1; b := 3.0; c := 'c';
writeln(a:4,b:7:2,c:3);
{Will write out
bbb4bbb3.00bbc
where "b" indicates a blank.}

WRITELN - write an output line of text.

Usage:

Where:

Description:

Examples:

See Also: