1.上代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Suke.day03
{
    internal class Class1
    {
        static void Main(string[] args)
        {
            int a, b, c;
            double area, p;
            a = int.Parse(Console.ReadLine());
            b = int.Parse(Console.ReadLine());
            c = int.Parse(Console.ReadLine());
            p = (a + b + c) / 2.0;
            area = Math.Sqrt((p*(p-a)*(p-b)*(p-c)));
            Console.WriteLine("面积={0}",area);
            Console.ReadKey();
        }
    }
}

2.上展示