Question

所以我得到了这个C ++ Primer Plus，并且我需要编写一个程序来获取一个人的BMI，我需要以英尺和英寸为单位要求高度，然后转换成英寸，然后问这个人他们的体重（以磅为单位）并将其转换为千克，这就是它

我提前感谢帮助=）

继续收到此错误严重性代码描述项目文件行抑制状态错误C2086＆＃39;双倍英寸＆＃39;：重新定义ConsoleApplication14

  #include "stdafx.h"
  #include <iostream>

  using namespace std;

  int main()
{

    const double inchesFactor = 12;

    const double metersFactor = 0.0254;

    const double massFactor = 2.2;

    double height;
    double weight;
    double BMI;
    double inches;
    double mass;
    double meters;


    cout << "Enter height " << flush;
    cin >> height;
    cout << "Enter weight " << flush;
    cin >> weight;

    double inches = (height * inchesFactor);
    double mass = weight / massFactor;
    double meters = inches / 0.5;
    double BMI = mass / meters;

    cout << "Your BMI is " << BMI << endl;

Answer 1

以下代码运行，您需要删除额外的双打。我删除了#include "stdafx.h"因为我没有使用VS，但你可以把它放回去

#include <iostream>

  using namespace std;

  int main()
{

    const double inchesFactor = 12;

    const double metersFactor = 0.0254;

    const double massFactor = 2.2;

    double height;
    double weight;
    double BMI;
    double inches;
    double mass;
    double meters;


    cout << "Enter height " << flush;
    cin >> height;
    cout << "Enter weight " << flush;
    cin >> weight;

    inches = (height * inchesFactor);
    mass = weight / massFactor;
    meters = inches / 0.5;
    BMI = mass / meters;

    cout << "Your BMI is " << BMI << endl;

    return 0;
    }

Answer 2

让我们来看看你的代码。在这里，您声明了一堆import packA.A;类型的变量：

double

然后你要求用户输入身高和体重：

double height;
double weight;
double BMI;
double inches;
double mass;
double meters;

在这里你做了大量的计算：

cout << "Enter height " << flush;
cin >> height;
cout << "Enter weight " << flush;
cin >> weight;

当你写double inches = (height * inchesFactor); double mass = weight / massFactor; double meters = inches / 0.5; double BMI = mass / meters;时，你告诉编译器＆＃34;我想要一个类型为double inches = (height * inchesFactor);的新变量使用名称double，我想将其设置为inches的值。但是你不能创建一个名为(height * inchesFactor)的新变量，因为你之前已经声明了一个带有该名称的变量。

如果你省略了类型而只是写inches，那么你就是在告诉编译器：＆＃34;我想设置变量inches = (height * inchesFactor);， 我是＆＃39; ve在其他地方宣布 ，价值为inches。

因此，要修复代码，请将上面的最后一段代码替换为：

(height * inchesFactor)

因为您之前已经宣布过inches = (height * inchesFactor); mass = weight / massFactor; meters = inches / 0.5; BMI = mass / meters;，inches，mass和meters。

我一直得到编译器错误C2086

2 个答案: