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copied!<p>This number comes from the ISO C standard, <a href="http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf" rel="nofollow">ISO/IEC 9899:1999</a>:</p> <blockquote> <p><strong>5.2.4.1 Translation limits</strong></p> <p>The implementation shall be able to translate and execute at least one program that contains at least one instance of every one of the following limits:</p> <ul> <li><strong>127 nesting levels of blocks</strong></li> <li>63 nesting levels of conditional inclusion</li> <li>12 pointer, array, and function declarators (in any combinations) modifying an arithmetic, structure, union, or incomplete type in a declaration</li> <li>63 nesting levels of parenthesized declarators within a full declarator</li> <li>63 nesting levels of parenthesized expressions within a full expression</li> <li>63 significant initial characters in an internal identifier or a macro name (each universal character name or extended source character is considered a single character)</li> <li>31 significant initial characters in an external identifier (each universal character name specifying a short identifier of 0000FFFF or less is considered 6 characters, each universal character name specifying a short identifier of 00010000 or more is considered 10 characters, and each extended source character is considered the same number of characters as the corresponding universal character name, if any)</li> <li>4095 external identifiers in one translation unit</li> <li>511 identifiers with block scope declared in one block</li> <li>4095 macro identifiers simultaneously defined in one preprocessing translation unit</li> <li>127 parameters in one function definition</li> <li>127 arguments in one function call</li> <li>127 parameters in one macro definition</li> <li>127 arguments in one macro invocation</li> <li>4095 characters in a logical source line</li> <li>4095 characters in a character string literal or wide string literal (after concatenation)</li> <li>65535 bytes in an object (in a hosted environment only)</li> <li>15 nesting levels for #included files</li> <li>1023 case labels for a switch statement (excluding those for any nested switch statements)</li> <li>1023 members in a single structure or union</li> <li>1023 enumeration constants in a single enumeration</li> <li>63 levels of nested structure or union definitions in a single struct-declaration-list</li> </ul> </blockquote> <p>These are the <em>minimum</em> values a conforming C compiler must be able to handle.</p>

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