C++,输入体重,身高,算bmi

C++,输入体重,身高,算bmi
1.Ask for the user for his first name.输入你的姓名
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2.Ask the user whether he wants to use metric or standard system.选择哪种方式来计算
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3.Based on the choice of the system,prompt to ask weight and height.Use the answer
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and the appropriate formula to calculate the user’s bmi.根据选择的方式输入体重和身高（磅和英尺,或千克和米）
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4.Prints out to the user (addressed with his name) what his BMI is.输出,用户的姓名和bmi的值
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5.Prints out which category of weight he belongs to depending on his BMI.输出,用户的姓名,和更具bmi的值用户的体重属于哪一类的.
BMI = weight (kg) /（ (height (m))（height(m))
BMI = weight (lb) / ((height (in)(height(in))*703
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Underweight if BMI < 18.5
Normal if 18.5 ≤ BMI < 25.0
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Overweight if 25.0 ≤ BMI < 30.0
Obese if 30.0 ≤ BMI
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Here are two sample output
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v:\cmpsc101
Type your first name (with no space):
Michael
Type metric for metric system,type standard for standard system:
standard
Type in your weight in pound and your height in inch:
180
70.5
Michael,your BMI is 25.4595
Michael,you are considered to be Overweight.
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v:\cmpsc101
Type your first name (with no space):
John
Type metric for metric system,type standard for standard system:
metric
Type in your weight in kilogram and your height in meter:
25
1
John,your BMI is 25
John,you are considered to be Overweight.
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v:\cmpsc101
Type your first name (with no space):
Dora
Type metric for metric system,type standard for standard system:
unknown
Type in your weight in pound and your height in inch:
100
65.2
Dora,your BMI is 16.5371
Dora,you are considered to be Underweight.
谁知道这个c++的code要怎么写,code中需要用到system和category.

#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;
class person {//新建人物类
public:
    person();
    ~person();

    void setname(string inputname){
        name=inputname;
    }

    string getname(){
        return name;
    }

    void setbmi(double bmi){
        person::bmi=bmi;
    }

    double getbmi(){
        return bmi;
    }

private:
    string name;//姓名
    double bmi;//BMI
};

person::person(){

}

int main(){
    person* p1=new person();//人物对象
    string text1 = "Type your first name (with no space):";
    string text2 = "Type metric for metric system, type standard for standard system:";
    string input;
    string weight,height;
    double bmi;
    int choice;

    bmi=0.0;
    cout<<text1<<endl;
    cin>>input;
    p1->setname(input);
    cout<<text2<<endl;
    cin>>input;
    if(input=="standard")//判断属于那种system
        choice=0;
    else if (input=="metric")
        choice=1;
    else if (input=="unknow")
        choice=2;

    switch(choice){
    case 0:
        cout<<"Type in your weight in pound and your height in inch:"<<endl;
        cin>>weight>>height;
        bmi=((atof((weight.c_str())))/((atof(height.c_str()))*(atof(height.c_str()))))*703;//计算bmi
        p1->setbmi(bmi);
        break;
    case 1:
        cout<<"Type in your weight in kilogram and your height in meter:"<<endl;
        cin>>weight>>height;
        bmi=(atof(weight.c_str()))/((atof(height.c_str()))*(atof(height.c_str())));
        p1->setbmi(bmi);
        break;
    case 2:
        cout<<"Type in your weight in pound and your height in inch:"<<endl;
        cin>>weight>>height;
        bmi=((atof((weight.c_str())))/((atof(height.c_str()))*(atof(height.c_str()))))*703;
        p1->setbmi(bmi);
        break;
    }
    cout<<p1->getname()<<", your BMI is "<<p1->getbmi()<<endl;
    cout<<p1->getname()<<", you are considered to be ";
    if(p1->getbmi()<18.5){//判断category
        cout<<"Underweight"<<endl;
    }
    else if(p1->getbmi()<25.0){
        cout<<"Normal"<<endl;
    }
    else if(p1->getbmi()<30.0){
        cout<<"Overweight"<<endl;
    }
    else {
        cout<<"Obese"<<endl;
    }
}基本上行了,你试试,至于system和category,system是关键字,不过用不上,category可以弄成一个变量,我这里没用,也没必要.