Enforced immutability: Difference between revisions
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Constants in COBOL are not stored in memory, but are closer to C's macros, by associating a literal with a name. |
Constants in COBOL are not stored in memory, but are closer to C's macros, by associating a literal with a name. |
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Prior to COBOL 2002, you could define figurative literals for characters only: |
Prior to COBOL 2002, you could define figurative literals for characters only: |
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<syntaxhighlight lang="cobol">ENVIRONMENT DIVISION. |
<syntaxhighlight lang="cobol"> ENVIRONMENT DIVISION. |
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CONFIGURATION SECTION. |
CONFIGURATION SECTION. |
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SPECIAL-NAMES. |
SPECIAL-NAMES. |
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SYMBOLIC CHARACTERS NUL IS 0, TAB IS 9.</syntaxhighlight> |
SYMBOLIC CHARACTERS NUL IS 0, TAB IS 9.</syntaxhighlight> |
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A new syntax was introduced in COBOL 2002 which allowed defining constants for other types. |
A new syntax was introduced in COBOL 2002 which allowed defining constants for other types. |
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<syntaxhighlight lang="cobol">01 Foo CONSTANT AS "Foo".</syntaxhighlight> |
<syntaxhighlight lang="cobol"> 01 Foo CONSTANT AS "Foo".</syntaxhighlight> |
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Prior to COBOL 2002, there were non-standard extensions available that also implemented constants. One extension was the the 78 level-number: |
Prior to COBOL 2002, there were non-standard extensions available that also implemented constants. One extension was the the 78 level-number: |
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<syntaxhighlight lang="cobol">78 Foo VALUE "Foo".</syntaxhighlight> |
<syntaxhighlight lang="cobol"> 78 Foo VALUE "Foo".</syntaxhighlight> |
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Another was the <code>CONSTANT SECTION</code>: |
Another was the <code>CONSTANT SECTION</code>: |
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<syntaxhighlight lang="cobol">CONSTANT SECTION. |
<syntaxhighlight lang="cobol"> CONSTANT SECTION. |
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01 Foo VALUE "Foo".</syntaxhighlight> |
01 Foo VALUE "Foo".</syntaxhighlight> |
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=={{header|D}}== |
=={{header|D}}== |
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