Parameters in methods (formal parameters, formal parameters) and method calls

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            //Console.WriteLine("Hello World!");
            int a = 10;
            int b = 20;
            Ca(a, b);
           
        }
        public static void Ca(int x,int y)
        {
            int m = x + y;
            Console.WriteLine(m);
        }
      
    }
}

Among them, a and b are actual parameters, and x and y are formal parameters.

The parameters in the definition method are formal parameters, and the parameters in the calling method are actual parameters

like

int Add(int a,int b){//.....} There are two formal parameters ab in the Add method, and two comma-separated int actual parameters must be provided when calling, such as Add(30,20); You can also change the two actual parameters into int variable names, such as int x=30;int y=20;Add(x,y);

Method call:

When calling methods of other objects, the object name prefix should be added in front of the method name, such as

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApp1
{
    class Class1
    {
        public static void Tosting(int x,int y)
        {
            int m = x + y;
            Console.WriteLine("x+y=" + m);
        }
    }
}

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            //Console.WriteLine("Hello World!");
            int a = 10;
            int b = 20;
            Ca(a, b);
           
        }
        public static void Ca(int x,int y)
        {
            Class1.Tosting(x, y);//调用其它对象的方法
        }
      
    }
}