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Integer types smaller than int are promoted when an operation is performed on them. If all values of the original type can be represented as an int, the value of the smaller type is converted to an int; otherwise, it is converted to an unsigned int. Integer promotions are applied as part of the usual arithmetic conversions to certain argument expressions, operands of the unary {+}, -, and {~} operators, and operands of the shift operators. The following code fragment illustrates the application of integer promotions:
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\[[Dowd 06|AA. C References#Dowd 06]\] Chapter 6, "C Language Issues" (Type Conversions 223-270)
\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 6.3, "Conversions"
\[[ISO/IEC DTR 24772-2007|AA. C References#]\] Language Vulnerability "XYE Numeric Conversion Errors"
\[[ISO/IEC PDTR 24772|AA. C References#ISO/IEC PDTR 24772]\] "FLC Numeric Conversion Errors"
\[[MISRA 04|AA. C References#MISRA 04]\] Rules 10.1, 10.3, 10.5, and 12.9
\[[MITRE 07|AA. C References#MITRE 07]\] [CWE ID 192|http://cwe.mitre.org/data/definitions/192.html], "Integer Coercion Error"; [CWE ID 197|http://cwe.mitre.org/data/definitions/197.html], "Numeric Truncation Error"
\[[Seacord 05|AA. C References#Seacord 05]\] Chapter 5, "Integers" |
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