| Revision as of 16:47, 16 July 2012 editEnric Naval (talk | contribs)Extended confirmed users, Pending changes reviewers, Rollbackers30,509 edits →ExamplesThese examples are from COBOL.: no need for a footnote.← Previous edit | Revision as of 11:08, 13 September 2012 edit undo80.149.113.234 (talk) →The S symbol was marked as not displayed. This seems to be a typo, because also in your examples the S requires extra space in the output and is visible (unlike the V-picture symbol which is really not displayed)Next edit → | ||
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| |bgcolor="#E0FFFF" align="center"| '''S''' | |bgcolor="#E0FFFF" align="center"| '''S''' | ||
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| |bgcolor="#E0FFFF" align="center"| '''V''' | |bgcolor="#E0FFFF" align="center"| '''V''' | ||
Revision as of 11:08, 13 September 2012
A picture clause is an element in programming languages that is used to describe a datum, by using sample characters that indicate the item characteristics and size.
History
The picture clause was first used in the COMTRAN (Commercial Translator) language developed by Bob Bemer of IBM in 1957. In 1959, it was incorporated into the original definition of COBOL. Since then, many other programming languages have copied this feature.
Formatting
A picture clause is made up of various format characters, each of which represents a certain portion of the data item. Each format character can be repeated or followed by a repeat number, which specifies the number of times the format item occurs in the data item. Some examples (from COBOL) are:
| Character | Description |
|---|---|
| A | Alphabetic character (A-Z, a-z, or blank) |
| B | Blank (space) character |
| CR | Sign indicator ('CR' if negative, blanks if positive) |
| DB | Sign indicator ('DB' if negative, blanks if positive) |
| E | Floating-point exponent |
| G | Double-byte (DBCS) graphic/alphanumeric character |
| N | Double-byte (DBCS) character |
| P | Implied scaling digit (not displayed) |
| S | Implied sign |
| V | Implied decimal point (not displayed) |
| X | Any character, alphabetic, numeric, or other symbols |
| Z | Numeric digit, but leading-zero-suppressed (replaced by a blank when equal to zero) |
| 0 | Inserted '0' digit |
| 9 | Numeric digit (0-9) |
| / | Inserted '/' character |
| , | Inserted digit group separator |
| . | Inserted decimal point |
| + | Sign ('-' if negative, '+' if positive) |
| - | Sign ('-' if negative, blank if positive) |
| $ | Floating currency sign (blank for leading zeroes, '$' to the left of the most significant digit, otherwise digit 0-9) |
| * | Floating digit fill ('*' for leading zeroes, otherwise digit 0-9) |
Examples
Examples from COBOL.
| picture clause | data type | sample contents |
|---|---|---|
| PIC 999 | 3-digit number | 123, 005, 087, any number from 000 through 999 |
| PIC S999 | 3-digit internally signed number | +123, -005, +087, any number from -999 through +999 |
| PIC +999 | 3-digit output signed number | +123, -005, +087, any number from -999 through +999, with sign displayed. |
| PIC ZZ9 | 3-digit number, leading zeros suppressed | 123, 5, 87, any number from 000 through 999 |
| PIC A(8) | 8-character alphabetic string | "Fredrick", "Fred ", "Fred Jr ", any string of 8 alphabetic letters (may include spaces) |
| PIC X(8) | 8-character string | "Smithson", "O'Riley ", "Bon-Jovi", "23Skidoo", any string of 8 characters (may include any valid character) |
Footnotes
- ^ Non-standard extension provided by IBM and others.
- ^ The comma and decimal point can be switched for European use.
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