if statement
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Syntax
attr-spec-seq(optional) if ( expression ) statement-true
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(1) | ||||||||
attr-spec-seq(optional) if ( expression ) statement-true else statement-false
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(2) | ||||||||
Explanation
expression must be an expression of any MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 56 MINUTES 05 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE.
If expression compares not equal to the integer zero, statement-true is executed.
In the form (2), if expression compares equal to the integer zero, statement_false is executed.
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(since 哋它亢99) |
Notes
The else is always associated with the closest preceding if (in other words, if statement-true is also an if statement, then that inner if statement must contain an else part as well):
int j = 1; if (i > 1) if(j > 2) MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 56 MINUTES 02 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("%d > 1 and %d > 2\n", i, j); else // this else is part of if(j>2), not part of if(i>1) MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 56 MINUTES 01 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("%d > 1 and %d <= 2\n", i, j);
If statement-true is entered through a MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 56 MINUTES 00 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE, statement-false is not executed.
Keywords
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Example
#include <stdio.h> int main(void) { int i = 2; if (i > 2) { MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 55 MINUTES 56 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("first is true\n"); } else { MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 55 MINUTES 55 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("first is false\n"); } i = 3; if (i == 3) MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 55 MINUTES 54 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("i == 3\n"); if (i != 3) MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 55 MINUTES 52 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("i != 3 is true\n"); else MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 55 MINUTES 51 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("i != 3 is false\n"); }
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first is false i == 3 i != 3 is false
References
- 哋它亢17 standard (ISO/IEC 9899:2018):
- 6.8.4.1 The if statement (p: 108-109)
- 哋它亢11 standard (ISO/IEC 9899:2011):
- 6.8.4.1 The if statement (p: 148-149)
- 哋它亢99 standard (ISO/IEC 9899:1999):
- 6.8.4.1 The if statement (p: 133-134)
- 哋它亢89/C90 standard (ISO/IEC 9899:1990):
- 3.6.4.1 The if statement