HP 3000 Manuals HP 3000 Manuals
Data Division (cont)
Syntax Rules
1. The OVERLINE clause can be used with a screen item.
2. If the OVERLINE clause is specified at group level, it applies to
all suitable subordinate elementary items.
3. If this clause is used on a system that does not support overlining
it has no effect.
General Rule
The OVERLINE clause causes every character of the screen item to have a
horizontal line above it when the item appears on the screen.
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|(MF) (XOPEN) |
| |
|The PICTURE Clause in the Screen Section |
| |
|Function |
| |
|The PICTURE clause describes the length, general characteristics and |
|editing requirements of a screen item. The FROM, TO and USING phrases|
|identify the source of data for display and the destination of data |
|accepted. |
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General Format
Click here to view figure.
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|(MF) (XOPEN) |
| |
|Syntax Rules |
| |
| |
| |
|1. The PICTURE clause can include any standard editing characters. |
| |
|2. Each PICTURE clause must contain either a FROM, TO or USING |
| phrase. |
| |
|3. PIC is an abbreviation for PICTURE. |
| |
|4. The USING phrase is equivalent to the TO and FROM phrases, both |
| specifying the same identifier. |
| |
|5. The PICTURE clause is allowed only with elementary items. |
| |
|6. The identifier in the FROM, TO or USING phrase can be qualified. |
| If no OCCURS clause applies to the screen item, then this |
| identifier can be subscripted or indexed. It must be defined in |
| the File, Working-Storage, Local-Storage, (MF) or Linkage Section|
| of the program. |
| |
|7. The PICTURE clause need not be the same as the PICTURE clause of |
| the data item referenced in the FROM, TO or USING clause but it |
| must be such that the implied MOVE is legal. |
| |
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|(MF) (XOPEN) |
| |
|General Rules |
| |
| |
| |
|1. The character-string describes the length and category of the |
| screen item. It is used in the same way as the character-string |
| in the PICTURE clause for a data item. |
| |
|2. Executing a DISPLAY statement on a screen item whose description |
| includes a FROM or USING phrase moves data from the associated |
| data item to the screen item, and then displays the screen item |
| on the screen. |
| |
|3. Executing an ACCEPT statement on a screen item whose description |
| includes a TO or USING phrase accepts operator-keyed data into |
| the screen item, and then moves that data to the associated data |
| item. |
| |
|4. It is recommended that every numeric screen item either be a |
| numeric-edited item or contain only 9's in its PICTURE clause. |
| Editing and de-editing are applied as necessary when data is |
| moved to or from the associated data item. |
| |
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|(MF) (XOPEN) |
| |
|The PROMPT Clause |
| |
|Function |
| |
|The PROMPT clause causes the empty character positions in the screen |
|item to be marked on the screen during an ACCEPT operation while |
|the system is ready to accept operator-keyed data into that |
|item. |
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General Format
Click here to view figure.
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|(MF) (XOPEN) |
| |
|Syntax Rules |
| |
| |
| |
|1. This clause is allowed only with input and update fields and with|
| group items. |
| |
|2. If this clause is specified at group level, it applies to all |
| subordinate elementary items. |
| |
|3. Identifier-1 must be a single-character alphabetic or |
| alphanumeric data item. |
| |
|4. Identifier-1 must not be subject to an OCCURS clause. |
| |
|5. Literal-1 must be a one-character nonnumeric literal or a |
| figurative constant. |
| |
| |
|General Rules |
| |
| |
| |
|1. If the CHARACTER phrase is not specified, the PROMPT clause is |
| documentary only. |
| |
|2. The CHARACTER phrase specifies a prompt character to be used for |
| marking empty character positions. The prompt character |
| overrides the configured option. (See your COBOL System |
| Reference for details on configuration options.) |
| |
|3. The PROMPT clause causes the prompt character to replace trailing|
| spaces in alphanumeric or free-format numeric screen items. |
| It also causes the prompt character to replace leading |
| suppressed digit positions in fixed-format numeric-edited screen |
| items. |
| |
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________________________________________________________________________
|(MF) (XOPEN) |
| |
| |
| |
|4. The PROMPT clause has no effect on fixed-format, non-edited |
| numeric screen items or numeric-edited screen items that have no |
| zero-suppression positions. |
| |
|5. This clause has no effect if the SECURE clause is specified. |
| |
|6. The prompt characters appearing in the screen item are changed to|
| spaces upon termination of the ACCEPT operation. |
| |
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|(MF) (XOPEN) |
| |
|The PROTECT Clause |
| |
|Function |
| |
|The PROTECT clause specifies that input to an ACCEPT item is to be |
|prevented. |
| |
|General Format |
| |
| PROTECT |
| |
|Syntax Rule |
| |
|The PROTECT clause may be specified only for an elementary screen |
|description entry. |
| |
|General Rule |
| |
|The PROTECT clause specifies that input to an ACCEPT item is to be |
|prevented. |
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|(MF) (XOPEN) |
| |
|The REQUIRED Clause |
| |
|Function |
| |
|The REQUIRED clause specifies that the operator must not leave the |
|screen item empty. |
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General Format
Click here to view figure.
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|(MF) (XOPEN) |
| |
|Syntax Rules |
| |
| |
| |
|1. The REQUIRED clause is allowed only with input and update fields |
| and with group items. |
| |
|2. This clause can be specified on a group screen item, in which |
| case it applies to all suitable elementary items which are |
| subordinate to that item. |
| |
|3. REQUIRED and EMPTY-CHECK are equivalent. (MF) |
| |
| |
|General Rules |
| |
| |
| |
|1. The REQUIRED clause takes effect during the execution of any |
| ACCEPT statement that causes the screen item to be accepted |
| provided the cursor enters the screen item at some time during |
| the ACCEPT. Unless this clause is satisfied, terminator |
| keystrokes are rejected and the cursor is repositioned to the |
| beginning of the item. |
| |
|2. To satisfy this clause, alphanumeric screen items must contain at|
| least one non-space, non-prompt character; numeric screen items |
| must have a non-zero value. |
| |
|3. For update fields, the REQUIRED clause can be satisfied by |
| initial data as well as by operator-keyed data. |
| |
|4. The REQUIRED clause can not be effective if a function key is |
| used to terminate an ACCEPT operation. (See your COBOL System |
| Reference for details on configuration options.) |
| |
|5. An error message can be configured for display on the screen if |
| the REQUIRED clause is not satisfied. (See your COBOL System |
| Reference for details on configuration options.) |
| |
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|(MF) (XOPEN) |
| |
|The REVERSE-VIDEO Clause |
| |
|Function |
| |
|The REVERSE-VIDEO clause causes the screen item to be displayed in |
|reverse-video. |
| |
|General Format |
| |
| REVERSE-VIDEO |
| |
|Syntax Rules |
| |
| |
| |
|1. The REVERSE-VIDEO clause is allowed with any screen item. |
| |
|2. If the REVERSE-VIDEO clause is specified at group level, it |
| applies to all suitable subordinate elementary items. |
| |
| |
|General Rule |
| |
|The REVERSE-VIDEO clause causes the screen item to be displayed in |
|reverse-video. |
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|(MF) (XOPEN) |
| |
|The SECURE Clause |
| |
|Function |
| |
|The SECURE clause prevents operator-keyed data from appearing on the |
|screen. |
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General Format
Click here to view figure.
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|(MF) (XOPEN) |
| |
|Syntax Rules |
| |
| |
| |
|1. The SECURE clause is allowed only with input and update |
| fields. |
| |
|2. This clause can be specified on a group screen item, in which |
| case it applies to all suitable elementary items which are |
| subordinate to that item. |
| |
|3. SECURE and NO-ECHO are equivalent. |
| |
| |
|General Rule |
| |
|When the SECURE clause is specified for input fields, only spaces and |
|the cursor appear in the screen item. For update fields, the |
|original contents of the field will be displayed, but cannot be |
|altered. |
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|(MF) (XOPEN) |
| |
|The SIGN Clause in the Screen Section |
| |
|Function |
| |
|The SIGN clause specifies the position and representation of the |
|operational sign. |
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General Format
Click here to view figure.
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|(MF) (XOPEN) |
| |
|Syntax Rules |
| |
| |
| |
|1. The SIGN clause is allowed only with input, output and update |
| fields whose pictures contain the character "S". |
| |
|2. This clause is allowed only with elementary items. |
| |
| |
|General Rule |
| |
|It is recommended that the SEPARATE option be used when the SIGN |
|clause is specified in a screen description. If the SEPARATE option |
|is not specified, a sign denoted by "S" in a PICTURE clause appears as|
|an overpunch. |
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|(MF) (XOPEN) |
| |
|The SIZE Clause |
| |
|Function |
| |
|The SIZE clause specifies the current size of the screen item. |
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General Format
Click here to view figure.
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|(MF) (XOPEN) |
| |
|Syntax Rules |
| |
| |
| |
|1. The SIZE clause is allowed only with elementary screen |
| items. |
| |
|2. Identifier-1 must be an unsigned numeric integer and must not be |
| subject to an OCCURS clause. |
| |
|3. Integer-1 must be unsigned. |
| |
| |
|General Rules |
| |
| |
| |
|1. The SIZE clause has no effect if the size specified is |
| zero. |
| |
|2. If the SIZE clause is specified for a numeric or numeric-edited |
| screen item and the size specified is not zero, the screen item |
| is treated as though it were free-format. This overrides the |
| setting of the configuration option. |
| |
|3. If the size specified in the SIZE clause is less than that |
| implied by the associated PICTURE or VALUE clause, only the |
| left-hand portion of the screen item appears on the screen. If |
| the JUSTIFIED clause is present, then only the right-hand |
| portion of the screen item appears. The remainder of the |
| screen item can be considered to contain spaces or zeros, as |
| appropriate. |
| |
|4. If the size specified in the SIZE clause is greater than |
| that implied by the PICTURE or VALUE clause for output or |
| literal fields, the screen item is padded on the right with |
| spaces. |
| |
|5. Changing the value in identifier-1 alters the effective size of |
| the screen item at run-time. This can alter the screen positions|
| of items whose descriptions follow it in the Screen Section. |
| (See the sections The LINE Clause and The COLUMN Clause earlier |
| in this chapter.) |
| |
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|(MF) (XOPEN) |
| |
|The UNDERLINE Clause Function |
| |
|The UNDERLINE clause causes the screen item to be underlined when it |
|appears on the screen. |
| |
|General Format |
| |
| UNDERLINE |
| |
|Syntax Rules |
| |
| |
| |
|1. The UNDERLINE clause is allowed with any screen item. |
| |
|2. If the UNDERLINE clause is specified at group level, it applies |
| to all suitable subordinate elementary items. |
| |
|3. This clause has no effect if your screen hardware does not |
| support underline. |
| |
| |
|General Rule |
| |
|The UNDERLINE clause causes the screen item to be underlined when it |
|appears on the screen. |
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________________________________________________________________________
|(MF) (XOPEN) |
| |
|The VALUE Clause in the Screen Section Function |
| |
|The VALUE clause specifies literal information for display on the |
|Screen |
| |
|General Format |
| |
| [VALUE IS] literal-1 |
| |
|Syntax Rules |
| |
| |
| |
|1. The literal associated with the VALUE clause must be nonnumeric. |
| It cannot be a figurative constant. |
| |
|2. The VALUE clause is allowed only with elementary items that have |
| no PICTURE clause. |
| |
| |
|General Rule |
| |
|The VALUE clause specifies literal information for display on the |
|screen. |
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The ZERO-FILL Clause
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|(MF) (XOPEN) |
| |
|Function |
| |
|The ZERO-FILL clause causes trailing prompt characters to be replaced |
|by zeros instead of spaces. |
| |
|General Format |
| |
| ZERO-FILL |
| |
|Syntax Rule |
| |
|This clause is allowed only with input and update fields that are |
|alphabetic or alphanumeric. |
| |
|General Rules |
| |
| |
| |
|1. The ZERO-FILL clause causes trailing prompt characters |
| to be replaced by zeros instead of spaces when data is |
| moved from the screen item to the receiving item. This |
| occurs only if the operator enters data into the screen |
| item. |
| |
|2. If the receiving item has a JUSTIFIED clause, the ZERO-FILL |
| clause causes leading positions left vacant by justification to |
| be zero-filled. |
| |
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