算术运算符

        static void Main(string[] args)
        {
            //算术运算符: + - * /  %
            //演示:某学生三门功课的成绩分别是: 语文85 数学 95 英语 75 求总分和平均分;
            double douChinese = 85;
            double douMath = 95;
            double douEnglish = 74;
            Console.WriteLine("三门课的总分为{0},平均分为{1}", douChinese + douMath + douEnglish, Math.Round((douChinese + douMath + douEnglish) / 3,1));
            Console.ReadKey();
        }

 

        static void Main(string[] args)
        {
            int intNum1 = 100;
            int intNum2 = 33;
            Console.WriteLine("两个数字的和为:{0}", intNum1 + intNum1);
            Console.ReadKey();
        }

        static void Main(string[] args)
        {
            double pi = 3.14;
            double douBanJin = 5;
            Console.WriteLine("圆的面积是:{0},周长是:{1};", Math.Round(pi * douBanJin * douBanJin, 2), Math.Round(pi * douBanJin * 2, 2));
            Console.ReadKey();
        }