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Which header file is used to declare the complex number?

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Which header file is used to declare the complex number?

(a) complexnum

(b) complex

(c) complex number

(d) complexarg

I got this question in an interview for job.

This question is from Complex Number Type in chapter Source Files, Classes and Operator Overloading in C++ of C++

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Best answer
The correct choice is (b) complex

Easy explanation - <complex> header file is used for declaring a complex number in C++.

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