PRINT USING - QB64Official/qb64 GitHub Wiki
The PRINT USING statement is used to PRINT formatted data to the Screen or a file using a STRING template.
Syntax
PRINT [text${;|,}] USING template$; variable[; ...][{;|,}]
Parameter(s)
- Literal or variable STRING text$ can be placed between PRINT and USING or it can be included in the template.
- A semicolon or comma may follow the text to stop or tab the print cursor before the template PRINT.
- The literal or variable STRING template should use the template symbols to display each variable Variable Types in the list following it.
- The list of data variables used in the template are separated by semicolons after the template string value.
- In QB64 one semicolon or comma may follow the variable list to stop the print cursor for pending prints. QB only allowed a semicolon.
Description
- The variables should be listed in the order that they are used in the template from left to right.
- If the template string is omitted or symbols don't match the variable(s) an "Illegal Function Call" ERROR Codes will occur.
- Can convert numerical exponential or scientific notation values to normal decimal point values using less digits.
- NOTE: If the numerical value exceeds the template's digit range a % symbol will appear in the leftmost digit area.
- WARNING: The numbers displayed are rounded so the actual values are never changed and are actually more accurate.
Template is a literal or variable string using the following formatting characters:
| & | Prints an entire string value.�STRING�length should be limited as template width will vary. |
|---|---|
| \ �\ | Denotes the start and end point of a fixed string area with spaces between(LEN�= spaces + 2). |
| ! | Prints only the leading character of a string value. Exclamation points require underscore prefix. |
| # | Denotes a numerical digit. An appropriate number of digits should be used for values received. |
| ^^^^ | After # digits prints numerical value in exponential E+xx format. Use�^^^^^�for E+xxx values.* |
| . | Period sets a number's decimal point position. Digits following determine�rounded�value accuracy. |
| ,. | Comma�to left of decimal point, prints a comma every 3 used # digit places left of the decimal point. |
| + | Plus sign denotes the position of the number's sign. + or - will be displayed. |
| - | Minus sign (dash) placed after the number, displays only a negative value's sign. |
| $ | Prints a dollar sign immediately before the highest non-zero # digit position of the numerical value. |
| ** | Prints an asterisk in any leading empty spaces of a numerical value. Adds 2 extra digit positions. |
| **$ | Combines ** and $. Negative values will display minus sign to left of $. |
| _ | Underscore�preceding a format symbol prints those symbols as literal string characters. |
Note: Any string character not listed above will be printed as a literal text character.
- Any # decimal point position may be specified. The exponent is adjusted with significant digits left-justified.
QBasic
- QBasic limited the number of specified digit positions to 24; QB64 has no such restriction.
Example(s)
Printing formatted data using a predefined STRING template variable.
first$ = "Bobby": last$ = "Smith"
boxes% = 1510: sales! = 4530
tmp$ = "Salesperson: & & #####,. $$#####,.##"
PRINT USING tmp$; first$; last$; boxes%; sales!
Salesperson: Bobby Smith 1,510 $4,530.00
Explanation: The Salesperson: text precedes the formatted data. The name lengths will change the length of the string template accordingly so columns will not all line up. If \ \ was used, the columns would stay the same, but parts of some names might be lost. If the box or sales values exceed 3 digits, a comma is used in the value every 3 digits.
How to display formatting symbols as normal text using underscores in a PRINT USING template.
errcode = 35
PRINT USING "Error ## occurred!"; errcode
'the ! is now displayed at the end of the printed string
PRINT USING "Error ## occurred_!"; errcode
Error 35 occurred
Error 35 occurred!
Explanation: The first template will not print the exclamation points or error when the requested text parameters are omitted.
Exponential notation is designated after the leading digits are formatted. Digit places determine rounded value displayed.
PRINT USING "##.##^^^^"; 234.56
PRINT USING ".####^^^^-"; -777777
PRINT USING "+.##^^^^"; 123
PRINT USING "+.##^^^^^"; 123
2.35E+02
.7778E+06-
+.12E+03
+.12E+003
Explanation: Note how 5 carets in the bottom format expands the number of exponent digits to accommodate larger exponent values.
USING does not necessarily have to immediately follow PRINT, but it must follow it in the code line.
money = 12345.45
tmp$ = "$$#######,.##"
PRINT "I have this much money!"; USING tmp$; money
I have this much money! $12,345.45
Note: This can also be used to print the USING formatting characters outside of the template.