为什么这段代码不能返回值为 505.5 的 bpEffect 变量? [英] Why can this code not return the bpEffect variable with the value 505.5?

问题描述

以下代码的预期结果应该是 505.5，但它返回 3.97541e+70.为什么会这样?如何解决?

The expected result from the following code should be 505.5, but instead it returns 3.97541e+70. Why is this the case and how can the problem be solved ?

#include <iostream>
#include <string>
using namespace std;
class Position {
public:
    Position(int s, double p, string n) {
        shares = s;
        price = p;
        name = n;
    }
    double getBpEffect() {
        return bpEffect;
    }
private:
    string name;
    int shares;
    double price;
    double bpEffect = (shares*price) / 2;

};


int main() {
    Position xyz = Position(100, 10.11, "xyz");
    double buyingPower = xyz.getBpEffect();


    cout << buyingPower;

    system("pause");
    return 0;

}

推荐答案

double bpEffect = (shares*price)/2; 在你的构造函数主体之前运行使用 shares 和 price 中未定义的值.您需要在初始化其他变量后计算 bpEffect.

double bpEffect = (shares*price) / 2; is run before the body of your constructor using the undefined values in shares and price. You need to calculate bpEffect after you have initialized the other variables.

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