c#基础练习之if结构

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

namespace if语句
{
    class Program
    {
        static void Main(string[] args)
        {

             //如果张三的考试成绩大于90,那么爸爸奖励他100块钱。

            Console.WriteLine("请输入张三的成绩");
            int cj = Convert.ToInt32(Console.ReadLine());
            if (cj > 90)
            {
            /   Console.WriteLine("爸爸奖励100元");
            }
            else
            {
              Console.WriteLine("爸爸让写总结");
            }
            Console.ReadKey();

               //2如果张三的语文成绩大于90并且音乐成绩大于80,或者语文成绩等于100并且音乐成绩大于70,则奖励100元。

           Console.WriteLine("请输入张三的语文成绩");
           int chinese = Convert.ToInt32(Console.ReadLine());
           Console.WriteLine("请输入张三的音乐成绩");
           int yinyue = Convert.ToInt32(Console.ReadLine());
           bool cj; 
            if (cj = chinese > 90 && yinyue > 80 || chinese == 100 && yinyue > 70)
            {
                Console.WriteLine("爸爸奖励100元");
            }

            Console.ReadKey();

            ///3对结业考试成绩测评(要求用户输入一个具体成绩0-100分,程序根据成绩显示一个等级)
            (考虑用if还是用if-else)
             成绩>=90   A
            90> 成绩>=80   B
            80> 成绩>=70   C
            70> 成绩>=60   D
           成绩<60   E
            Console.WriteLine("请您输入一个具体的成绩");
            int cj = Convert.ToInt32(Console.ReadLine());
            if (cj >= 90)
          {
                Console.WriteLine("A");
            }
       if (cj < 90 && cj >= 80)
          {
                Console.WriteLine("B");
            }
            if (cj < 80 && cj >= 70)
            {
                Console.WriteLine("C");
            }
            if (cj < 70 && cj >= 60)
            {
               Console.WriteLine("D");
            }
            if  (cj<60)
            {
              Console.WriteLine("E");
            }
            Console.ReadKey();

            ///4.要求用户输入两个数a和b,如果a能够被b整除或者a加b大于100,则输出a否则输出b。
            Console.WriteLine("请您输入一个数字");
            int a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("请您输入一个数字");
            int b = Convert.ToInt32(Console.ReadLine());
            if (a % b == 0 || a + b > 100)
            {c
               Console.WriteLine("a");
            }
            else
            {
                Console.WriteLine("b");
            }
            Console.ReadKey();

//6.让用户输入用户名和密码,如果用户名为admin,密码为mypass,则提示登录成功。

            Console.WriteLine("请您输入密码:");
            int password = Convert.ToInt32(Console.ReadLine());
         
           
                if (password == 888888)
                {
                    Console.WriteLine("正确");

                }
                 if (password != 888888)
                {
                    Console.WriteLine("请您重新输入");
                }
                 if (password == 888888)
                {
                     Console.WriteLine("正确");
                 }
           
              Console.ReadKey();
        }
    }
}

原文地址:https://www.cnblogs.com/dyllove98/p/3144873.html