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2014.8.16 if语句

语句

if语句

大体可以分一下几种:

 

例子:

(一)根据月收入判断是否需要缴税

Console.Write("请输入你的月收入(元):");

double money = Convert.ToDouble(Console.ReadLine());

if (money >= 3500)

{

   Console.WriteLine("请交税");

   Console.WriteLine("谢谢合作!");

 }

else

{

    Console.WriteLine("继续努力");

    Console.WriteLine("谢谢合作!");

}

(二)根据 房子,钱,能力 判断女方是否与男方结婚

            try

            {

                Console.Write("你有房吗(true/false)?");

                bool house = Convert.ToBoolean(Console.ReadLine());

                if (house == true)

                {

                    Console.WriteLine("哦我们结婚吧!!!!");

                }

                else

                {

                    Console.Write("你有钱吗(true/false)?");

                    bool money = Convert.ToBoolean(Console.ReadLine());

                    if (money == true)

                    {

                        Console.WriteLine("先买房子再结婚!");

                    }

                    else

                    {

                        Console.Write("你有能力吗(true/false)?");

                        bool ability = Convert.ToBoolean(Console.ReadLine());

                        if (ability == true)

                        {

                            Console.WriteLine("骚年,先赚点钱吧!");

                        }

                        else

                        {

                            Console.WriteLine("滚蛋!!!!!!");

                        }

                    }

                }     

            }

            catch

            {

                Console.WriteLine("输入错误!");

            }

(三)求ax^2+bx+c=0的根

            try

            {

                Console.WriteLine("求ax^2+bx+c=0的根");

                Console.Write("a=");

                int a = Convert.ToInt32(Console.ReadLine());

                Console.Write("b=");

                int b = Convert.ToInt32(Console.ReadLine());

                Console.Write("c=");

                int c = Convert.ToInt32(Console.ReadLine());

                if (a == 0)

                {

                    Console.WriteLine("不是一元二次方程!");

                }

                else

                {

                    int delta = b * b - 4 * a * c;

                    if (delta > 0)

                    {

                        Console.WriteLine("x1={0},x2={1}", (-b + Math.Sqrt(delta) / 2 * a), (-b - Math.Sqrt(delta) / 2 * a));

                    }

                    else if (delta == 0)

                    {

                        Console.WriteLine("x=" + -b / 2 * a);

                    }

                    else

                    {

                        Console.WriteLine("方程无实根!");

                    }

                }

            }

            catch

            {

                Console.WriteLine("输入不对");

            }

(四)输入身高体重,判断健康状况

            try

            {

                Console.WriteLine("输入身高体重,判断健康状况");

                Console.Write("请输入性别:");

                string sex = Console.ReadLine();

                Console.Write("请输入身高:");

                int height = Convert.ToInt32(Console.ReadLine());

                Console.Write("请输入体重:");

                int weight = Convert.ToInt32(Console.ReadLine());

                if (sex == "男")

                {

                    int num = height - 100 - weight;

                    if (num > 3)

                    {

                        Console.WriteLine("偏瘦");

                    }

                    else if (num >= -3 && num <= 3)

                    {

                        Console.WriteLine("正常");

                    }

                    else

                    {

                        Console.WriteLine("偏胖");

                    }

 

                }

                else if (sex == "女")

                {

                    int num1 = height - 110 - weight;

                    if (num1 > 3)

                    {

                        Console.WriteLine("偏瘦");

                    }

                    else if (num1 >= -3 && num1 <= 3)

                    {

                        Console.WriteLine("正常");

                    }

                    else

                    {

                        Console.WriteLine("偏胖");

                    }

                }

            }

            catch

            {

                Console.WriteLine("输入有误!");

            }