# complex

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< c‎ | numeric‎ | complex

Defined in header `<complex.h>` |  |
#define complex _Complex |  | (since C99)

This macro expands to a type specifier used to identify complex types.

A program may undefine and perhaps then redefine the complex macro.

### References

- C11 standard (ISO/IEC 9899:2011):

  - 7.3.1/4 complex (p: 188)

- C99 standard (ISO/IEC 9899:1999):

  - 7.3.1/2 complex (p: 170)

### See also

imaginary (C99) | imaginary type macro (keyword macro)

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