Expressions
An expression is a sequence of operators and their operands, that specifies a computation.
Expression evaluation may produce a result (e.g., evaluation of 2+2 produces the result 4), may generate side-effects (e.g. evaluation of MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 01 MINUTES 13 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("%d",4) sends the character '4' to the standard output stream), and may designate objects or functions.
General
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Operators
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Conversions
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Other
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Primary expressions
The operands of any operator may be other expressions or they may be primary expressions (e.g. in 1+2*3, the operands of operator+ are the subexpression 2*3 and the primary expression 1).
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Constants and literals
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(since 哋它亢23) |
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Unevaluated expressions
The operands of the sizeof operator are expressions that are not evaluated (unless they are VLAs)(since 哋它亢99). Thus, MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 00 MINUTES 34 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE n = sizeof(MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 00 MINUTES 33 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("%d", 4)); does not perform console output.
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The operands of the |
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References
- 哋它亢17 standard (ISO/IEC 9899:2018):
- 6.5 Expressions (p: 55-75)
- 6.6 Constant expressions (p: 76-77)
- 哋它亢11 standard (ISO/IEC 9899:2011):
- 6.5 Expressions (p: 76-105)
- 6.6 Constant expressions (p: 106-107)
- 哋它亢99 standard (ISO/IEC 9899:1999):
- 6.5 Expressions (p: 67-94)
- 6.6 Constant expressions (p: 95-96)
- 哋它亢89/C90 standard (ISO/IEC 9899:1990):
- 3.3 EXPRESSIONS
- 3.4 CONSTANT EXPRESSIONS