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dynamic.aerospace.inc
Asked:2024-10-12 16:30:41 +0000 UTC2024-10-12 16:30:41 +0000 UTC

C++中计算exp的代码中的错误

  • 772

我编写了代码来计算该函数exp，但该代码无法正常工作。程序的结果正好是一半大，我该如何解决这个问题？

#include <iostream>

int factorial(int number);
float exp();

void main() {
    std::cout << exp() << std::endl;
}

float exp() {
    int x;
    float result = 1.0;
    std::cout << "Enter x: ";
    std::cin >> x;

    for (int i = 1; i <= x; ++i) {
        result += std::pow(x, i) / factorial(i);
    }
    return result;
}

int factorial(int number) {
    int result = 1;
    for (int i = 1; i <= number; ++i) {
        result *= i;
    }
    return result;
}
c++

1 个回答

  1. Best Answer

    好的，很清楚如何：

    #include <iostream>

using namespace std;

double Exp(double x, double eps)
{
    double sum = 1, term = 1;
    for(int n = 1; abs(term) >= eps; ++n)
        sum += term *= x/n;
    return sum;
}

int main()
{
    double x;
    cout << "Input x: ";
    cin >> x;
    cout << "exp(" << x << ") = " << Exp(x,1e-7) << endl;
}
    • 1

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