Question

How do you write Square in C++?

Answer 1

Standard C++ doesn't have a constant for PI. Many C++ compilers define M_PI in cmath (or in math. h for C) as a non-standard extension. You may have to #define _USE_MATH_DEFINES before you can see it.Nov 13, 2009');})();(function(){window.jsl.dh('_ZqCLYIOrB5LEsAXv6r0o43','

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https://www.codesdope.com \u203a c-preprocessor

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#define PI 3.14

Here, #define is a pre-processor directive. It is used to define something, like here we have defined that PI is 3.14. So, before going to the compiler, if 'PI' comes anywhere in the program, it will be replaced by 3.14.