Зміст курсу
C++ Data Types
C++ Data Types
Standard Math
In addition to the +
, -
, *
, /
, and %
operations, we can perform many more mathematical operations using functions from the <cmath>
library. Here is a table of the most used ones:
All of this is part of the standard math library. To use it, you need to include the appropriate header file. You can do this by including either cmath
or math.h
.
include
#include <cmath> // OR #include <math.h>
The main difference between cmath
and math.h
lies in their purpose and usage. cmath
is part of the C++ standard library, designed specifically for C++ and requiring the std
namespace (e.g., std::sqrt()
), while math.h
comes from the C standard library, uses the global namespace (e.g., sqrt()
), and is compatible with C++.
main
#include <iostream> #include <cmath> int main() { std::cout << "cos(0) = " << cos(0) << std::endl; std::cout << "sin(0) = " << sin(0) << std::endl; std::cout << "tan(pi/4) = " << tan(M_PI/4) << std::endl; std::cout << "exp(1) = " << exp(1) << std::endl; std::cout << "log(e) = " << log(M_E) << std::endl; std::cout << "pow(2, 3) = " << pow(2, 3) << std::endl; std::cout << "sqrt(4) = " << sqrt(4) << std::endl; std::cout << "cbrt(8) = " << cbrt(8) << std::endl; std::cout << "ceil(7.8) = " << ceil(7.8) << std::endl; std::cout << "floor(7.8) = " << floor(7.8) << std::endl; std::cout << "round(7.8) = " << round(7.8) << std::endl; }
Note
Constants
M_PI
andM_E
for value of π (3.1415...
) and e (2.7183...
) are also defined in the<cmath>
library.
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