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 Normal if 18.5 ≤ BMI \x09\x09\x09
Overweight if 25.0 ≤ BMI 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.