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The only value that can be considered interchangeable between pointers and integers is the constant 0. Except in this case, conversions between integers and pointers may have undesired consequences depending on the [implementation|BB. Definitions#implementation].  According to C99 \[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\]:

\[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] Section 6.3.2.3, "Pointers"
\[[ISO/IEC PDTR 24772|AA. C References#ISO/IEC PDTR 24772]\] "HFC Pointer casting and pointer type changes"
\[[MITRE 07|AA. C References#MITRE 07]\] [CWE ID 466|http://cwe.mitre.org/data/definitions/466.html], "Return of Pointer Value Outside of Expected Range," and [CWE ID 587|http://cwe.mitre.org/data/definitions/587.html], "Assignment of a Fixed Address to a Pointer"