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Section 6.3.1.4 of C99 \[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\] says:

When a finite value of real floating type is converted to an integer type other than _Bool, the fractional part is discarded (i.e., the value is truncated toward zero). If the value of the integral part cannot be represented by the integer type, the behavior is undefined.)

When a value of integer type is converted to a real floating type, if the value being converted can be represented exactly in the new type, it is unchanged. If the value being converted is in the range of values that can be represented but cannot be represented exactly, the result is either the nearest higher or nearest lower representable value, chosen in an implementation-defined manner. If the value being converted is outside the range of values that can be represented, the behavior is undefined.

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\[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\] Section 6.3.1.4, "Real floating and integer," and Section 6.3.1.5, "Real floating types"
\[[ISO/IEC PDTR 24772|AA. References#ISOBibliography#ISO/IEC PDTR 24772]\] "FLC Numeric Conversion Errors"
\[[IEEE 754|AA. References#IEEEBibliography#IEEE 754 2006]\] IEEE 754-1985 Standard for Binary Floating-Point Arithmetic
\[[MITRE 07|AA. References#MITREBibliography#MITRE 07]\] [CWE ID 681|http://cwe.mitre.org/data/definitions/681.html], "Incorrect Conversion between Numeric Types"

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