static void Main(string[] args)
{
while (true)
{
double a, b; string c, d, e, f;
Console.Write("请输入您的性别:");
c = Console.ReadLine();
Console.Write("请输入您的身高:");
a =Convert.ToDouble( Console.ReadLine());
Console.Write("请输入您的体重:");
b = Convert.ToDouble(Console.ReadLine());
d="您该增加营养";e="您该减肥了";f="您的体重正常";
Console.Write((c=="男")?(b-a+100>3?e:(b-a+100)<-3?d:f):(b-a+110>3?e:(b-a+110<-3?d:f)));
Console.ReadLine();
原文:http://www.cnblogs.com/lk-kk/p/4370321.html