C++ math庫函數測試方法

在C++中，我們可以使用<cmath>庫來進行數學運算

1. 測試平方根函數：

#include <iostream>
#include <cmath>

int main() {
    double number = 9.0;
    double squareRoot = sqrt(number);
    std::cout << "The square root of " << number << " is: " << squareRoot << std::endl;
    return 0;
}

2. 測試冪函數：

#include <iostream>
#include <cmath>

int main() {
    double base = 2.0;
    double exponent = 3.0;
    double power = pow(base, exponent);
    std::cout << "The power of " << base << " to the " << exponent << " is: " << power << std::endl;
    return 0;
}

3. 測試三角函數：

#include <iostream>
#include <cmath>

int main() {
    double angleInRadians = M_PI / 4; // 45 degrees in radians
    double sineValue = sin(angleInRadians);
    double cosineValue = cos(angleInRadians);
    double tangentValue = tan(angleInRadians);

    std::cout << "The sine of " << angleInRadians << " radians is: " << sineValue << std::endl;
    std::cout << "The cosine of " << angleInRadians << " radians is: " << cosineValue << std::endl;
    std::cout << "The tangent of " << angleInRadians << " radians is: " << tangentValue << std::endl;
    return 0;
}

4. 測試指數和對數函數：

#include <iostream>
#include <cmath>

int main() {
    double number = 2.0;
    double exponent = 3.0;
    double result = pow(number, exponent);
    std::cout << "The result of " << number << " raised to the power of " << exponent << " is: " << result << std::endl;

    double logarithmBase = 2.0;
    double logarithmValue = log(number) / log(logarithmBase);
    std::cout << "The logarithm of " << number << " to the base of " << logarithmBase << " is: " << logarithmValue << std::endl;
    return 0;
}

5. 測試取整函數：

#include <iostream>
#include <cmath>
#include <limits>

int main() {
    double number = 4.7;
    int integerPart = static_cast<int>(number);
    double fractionalPart = number - integerPart;

    std::cout << "The integer part of " << number << " is: " << integerPart << std::endl;
    std::cout << "The fractional part of " << number << " is: " << fractionalPart << std::endl;

    int ceilingValue = ceil(number);
    int floorValue = floor(number);

    std::cout << "The ceiling value of " << number << " is: " << ceilingValue << std::endl;
    std::cout << "The floor value of " << number << " is: " << floorValue << std::endl;

    return 0;
}

這些測試示例展示了如何使用C++的<cmath>庫進行基本的數學運算。在實際應用中，你可能需要根據具體需求對這些函數進行調整和擴展。