據說這是99 熬夜看影集的人會遇到的悲劇...
trigonometry - How to use the PI constant in C++ - Stack Overflow再看一集就好...再看一集就好... I want to use the PI constant and trigonometric functions in some C++ program. I get the trigonometric functions with include . However, there doesn't seem to be a definition for PI in this header file. How can I get PI without defining it manually?...
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