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A conditional in the C preprocessor begins with a conditional directive: ‘#if’, ‘#ifdef’ or ‘#ifndef’.
| • Ifdef: | ||
| • If: | ||
| • Defined: | ||
| • Else: | ||
| • Elif: | ||
• __has_attribute: | ||
• __has_cpp_attribute: | ||
• __has_builtin: | ||
• __has_include: |