Difference between revisions of "Format function"
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For an in-depth explanation see the [http://lazarus-ccr.sourceforge.net/docs/rtl/sysutils/format.html on line documentation]. | For an in-depth explanation see the [http://lazarus-ccr.sourceforge.net/docs/rtl/sysutils/format.html on line documentation]. | ||
| + | == Syntax == | ||
The formatting rule for each given argument is: | The formatting rule for each given argument is: | ||
% [ArgumentIndex] ['-'] [width] [. precision] ArgumentType | % [ArgumentIndex] ['-'] [width] [. precision] ArgumentType | ||
| Line 35: | Line 36: | ||
|- | |- | ||
| %8d | | %8d | ||
| − | | Will | + | | Will print the integer as it is. If the number of digits is less than 8, the output will be padded on the left. |
|- | |- | ||
| %-8d | | %-8d | ||
| − | | Will | + | | Will print the integer as it is. If the number of digits is less than 8, the output will be padded on the right. |
|- | |- | ||
| %.8d | | %.8d | ||
| − | | Will | + | | Will print the integer as it is. If the number of digits is less than 8, the output will be padded on the left with zeroes. |
|} | |} | ||
| Line 51: | Line 52: | ||
|- | |- | ||
| %8s | | %8s | ||
| − | | Will | + | | Will print the string as it is. If the string has less than 8 characters, the output will be padded on the left. |
|- | |- | ||
| %-8s | | %-8s | ||
| − | | Will | + | | Will print the string as it is. If the string has less than 8 characters, the output will be padded on the left. |
| − | |||
|} | |} | ||
Revision as of 21:23, 26 August 2016
The format function formats a series of values into a string. For an in-depth explanation see the on line documentation.
Syntax
The formatting rule for each given argument is:
% [ArgumentIndex] ['-'] [width] [. precision] ArgumentType
| d | Decimal (integer) |
| e | Scientific |
| f | Fixed |
| g | General |
| m | Money |
| n | Number (floating) |
| p | Pointer |
| s | String |
| u | Unsigned decimal |
| x | Hexadecimal |
Integer formatting
| %d | Will print the integer as it is. |
| %8d | Will print the integer as it is. If the number of digits is less than 8, the output will be padded on the left. |
| %-8d | Will print the integer as it is. If the number of digits is less than 8, the output will be padded on the right. |
| %.8d | Will print the integer as it is. If the number of digits is less than 8, the output will be padded on the left with zeroes. |
String formatting
| %s | Will print the string as it is. |
| %8s | Will print the string as it is. If the string has less than 8 characters, the output will be padded on the left. |
| %-8s | Will print the string as it is. If the string has less than 8 characters, the output will be padded on the left. |
Example to use
procedure TForm1.Button1Click(Sender: TObject);
var
title, title2,
underline,
line, row1, row2, row3,
fmt : string;
i : integer;
begin
fmt := '%-12s';
title := format(fmt,['Column 1']) + format(fmt,['Column 2']) ;
for i := 1 to 12 do underline := underline + '-';
underline := underline + underline ;
fmt := '%-12d';
line := format(fmt,[15]) + format(fmt,[8]) ;
fmt := '%12s';
title2 := format(fmt,['Column 1']) + format(fmt,['Column 2']) ;
fmt := '%12d';
row1 := format(fmt,[15]) + format(fmt,[8]) ;
row2 := format(fmt,[1005]) + format(fmt,[809]) ;
fmt := '%12.5d';
row3 := format(fmt,[1005]) + format(fmt,[809]) ;
Memo1.Lines.Add( title );
Memo1.Lines.Add( underline );
Memo1.Lines.Add( line );
Memo1.Lines.Add( '' );
Memo1.Lines.Add( title2 );
Memo1.Lines.Add( underline );
Memo1.Lines.Add( row1 );
Memo1.Lines.Add( row2 );
Memo1.Lines.Add( row3 );
end;The above statements will create a set of strings that look like:
Column 1 Column 2 ------------------------ 15 8
Column 1 Column 2
------------------------
15 8
1005 809
01005 00809
See also
- Format
- FloatToStrF
- FormatFloat
- IntToHex - Convert an integer into a hexadecimal string.
