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Which header file is required to use complex class in your program?

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Which header file is required to use complex class in your program?

(a) <complex>

(b) <math>

(c) <complex_math>

(d) <algorithm>

The question was posed to me in an online interview.

I want to ask this question from Complex Library topic in division Class Hierarchies, Library & Containers of C++

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The correct answer is (a) <complex>

Easiest explanation - <complex> header file is required to use the functionalitites of complex numbers.

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