C++ math库函数测试方法

在C++中，我们可以使用<cmath>库来进行数学运算

1. 测试平方根函数：

#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. 测试幂函数：

#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. 测试三角函数：

#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. 测试指数和对数函数：

#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. 测试取整函数：

#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;
}

这些测试示例展示了如何使用C++的<cmath>库进行基本的数学运算。在实际应用中，你可能需要根据具体需求对这些函数进行调整和扩展。