Ratio of learning_ add,ratio_ subtract,ratio_ multiply,ratio_ Use of divide

ratio It's proportional std::ratio Represents a proportion , Is to divide a given two integers to get a fraction ( Numerator and denominator ), for example 3/6, After that, it's 1/2. It is mainly used for very small units , such as , millisecond , Microsecond , mm , micron , Nano, etc . Here is ratio_add,ratio_subtract,ratio_multiply,ratio_divide Use .

class
ratio	Represents the exact rational fraction ( Class template )
The arithmetic
ratio_add (C++11)	Add two at compile time ratio object ( Alias template )
ratio_subtract (C++11)	Subtract two at compile time ratio object ( Alias template )
ratio_multiply (C++11)	Multiply two at compile time ratio object ( Alias template )
ratio_divide (C++11)	Divide two at compile time ratio object ( Alias template )

#include <iostream>
#include <ratio>


using namespace std;

int main()
{
    ratio<2, 6> two_six;
    ratio<3, 6> three_six;

    cout << "two_six======" << two_six.num << "/" << two_six.den << endl;
    cout << "two_six======" << three_six.num << "/" << three_six.den << endl;

    cout << "Hello World!" << endl;
    return 0;
}

 ratio_add Two ratio Add objects

#include <iostream>
#include <ratio>


using namespace std;

int main()
{
    ratio<2, 6> two_six;
    ratio<3, 6> three_six;

    cout << "two_six======" << two_six.num << "/" << two_six.den << endl;
    cout << "two_six======" << three_six.num << "/" << three_six.den << endl;

    ratio_add<decltype(two_six), decltype(three_six)> ratioAdd;
    cout << "ratio_add======" << ratioAdd.num << "/" << ratioAdd.den << endl;

    cout << "Hello World!" << endl;
    return 0;
}

ratio_subtract Two ratio Object subtraction 

#include <iostream>
#include <ratio>


using namespace std;

int main()
{
    ratio<2, 6> two_six;
    ratio<3, 6> three_six;

    cout << "two_six======" << two_six.num << "/" << two_six.den << endl;
    cout << "two_six======" << three_six.num << "/" << three_six.den << endl;

    ratio_subtract<decltype(two_six), decltype(three_six)> ratioSubtract;
    cout << "ratio_subtract======" << ratioSubtract.num << "/" << ratioSubtract.den << endl;

    cout << "Hello World!" << endl;
    return 0;
}

 

ratio_multiply Two ratio Multiply objects 

#include <iostream>
#include <ratio>


using namespace std;

int main()
{
    ratio<2, 6> two_six;
    ratio<3, 6> three_six;

    cout << "two_six======" << two_six.num << "/" << two_six.den << endl;
    cout << "two_six======" << three_six.num << "/" << three_six.den << endl;

    ratio_multiply<decltype(two_six), decltype(three_six)> ratioMultiply;
    cout << "ratio_multiply======" << ratioMultiply.num << "/" << ratioMultiply.den << endl;

    cout << "Hello World!" << endl;
    return 0;
}

 ratio_divide Two ratio Object division

#include <iostream>
#include <ratio>


using namespace std;

int main()
{
    ratio<2, 6> two_six;
    ratio<3, 6> three_six;

    cout << "two_six======" << two_six.num << "/" << two_six.den << endl;
    cout << "two_six======" << three_six.num << "/" << three_six.den << endl;

    ratio_divide<decltype(two_six), decltype(three_six)> ratioDivide;
    cout << "ratio_divide======" << ratioDivide.num << "/" << ratioDivide.den << endl;

    cout << "Hello World!" << endl;
    return 0;
}

 

Reference resources ：

Standard library header file <ratio> - cppreference.com

C++11 std::chrono Time bank _ Changle Village head's blog -CSDN Blog _std::chrono