using System;class JudgeGrade
{
public int score;
public int judge;
}class TestJudge
{
public static void Main(String[] args)
{
JudgeGrade aa = new JudgeGrade(); aa.score = Console.Read(); if (aa.score >= 90)
aa.judge = 1;
else if (aa.score >= 75 && aa.score <= 89)
aa.judge = 2;
else if (aa.score >= 60 && aa.score <= 74)
aa.judge = 3;
else if (aa.score < 60)
aa.judge = 4; switch (aa.judge)
{
case '1': Console.WriteLine("优"); break;
case '2': Console.WriteLine("良"); break;
case '3': Console.WriteLine("中"); break;
case '4': Console.WriteLine("差"); break;
}
Console.ReadKey(); }
}
{
public int score;
public int judge;
}class TestJudge
{
public static void Main(String[] args)
{
JudgeGrade aa = new JudgeGrade(); aa.score = Console.Read(); if (aa.score >= 90)
aa.judge = 1;
else if (aa.score >= 75 && aa.score <= 89)
aa.judge = 2;
else if (aa.score >= 60 && aa.score <= 74)
aa.judge = 3;
else if (aa.score < 60)
aa.judge = 4; switch (aa.judge)
{
case '1': Console.WriteLine("优"); break;
case '2': Console.WriteLine("良"); break;
case '3': Console.WriteLine("中"); break;
case '4': Console.WriteLine("差"); break;
}
Console.ReadKey(); }
}
应该用ReadLine()函数,用字符串去接收打断点自己一步步看变量都是什么值你就明白了 JudgeGrade aa = new JudgeGrade(); aa.score = Convert.ToInt32(Console.ReadLine()); if (aa.score >= 90)
aa.judge = 1;
else if (aa.score >= 75 && aa.score <= 89)
aa.judge = 2;
else if (aa.score >= 60 && aa.score <= 74)
aa.judge = 3;
else if (aa.score < 60)
aa.judge = 4; switch (aa.judge)
{
case 1: Console.WriteLine("优"); break;
case 2: Console.WriteLine("良"); break;
case 3: Console.WriteLine("中"); break;
case 4: Console.WriteLine("差"); break;
}
Console.ReadKey();
{
case 1: Console.WriteLine("优"); break;
case 2: Console.WriteLine("良"); break;
case 3: Console.WriteLine("中"); break;
case 4: Console.WriteLine("差"); break;
}
JudgeGrade aa = new JudgeGrade(); aa.score = Convert.ToInt32( Console.ReadLine()); if (aa.score >= 90)
aa.judge = 1;
else if (aa.score >= 75 && aa.score <= 89)
aa.judge = 2;
else if (aa.score >= 60 && aa.score <= 74)
aa.judge = 3;
else if (aa.score < 60)
aa.judge = 4; switch (aa.judge)
{
case 1: Console.WriteLine("优"); break;
case 2: Console.WriteLine("良"); break;
case 3: Console.WriteLine("中"); break;
case 4: Console.WriteLine("差"); break;
}
Console.ReadKey();
两个问题 1 aa.score = Convert.ToInt32( Console.ReadLine()); 强制转换为int
2 case 去掉单引号
using System;class JudgeGrade
{
public int score;
public int judge;
}class TestJudge
{
public static void Main(String[] args)
{
JudgeGrade aa = new JudgeGrade(); aa.score = Convert.ToInt32(Console.ReadLine()); if (aa.score >= 90)
aa.judge = 1;
else if (aa.score >= 75 && aa.score <= 89)
aa.judge = 2;
else if (aa.score >= 60 && aa.score <= 74)
aa.judge = 3;
else if (aa.score < 60)
aa.judge = 4; switch (aa.judge)
{
case 1: Console.WriteLine("优"); break;
case 2: Console.WriteLine("良"); break;
case 3: Console.WriteLine("中"); break;
case 4: Console.WriteLine("差"); break;
}
Console.Read(); }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace TestJudge
{
class Program
{
static void Main(string[] args)
{
bool isExit = true; //是否可以退出 JudgeGrade aa = new JudgeGrade(); while (isExit)
{
Console.WriteLine("请输入分数(整形数字): 按字母 Q 退出。"); string input = Console.ReadLine(); if (input.ToUpper() == "Q")
{
isExit = false;
break;
} aa.score = Convert.ToInt32(input); if (aa.score >= 90)
aa.judge = 1;
else if (aa.score >= 75 && aa.score <= 89)
aa.judge = 2;
else if (aa.score >= 60 && aa.score <= 74)
aa.judge = 3;
else if (aa.score < 60)
aa.judge = 4; switch (aa.judge)
{
case 1: Console.WriteLine("优"); break;
case 2: Console.WriteLine("良"); break;
case 3: Console.WriteLine("中"); break;
case 4: Console.WriteLine("差"); break;
}
}
} class JudgeGrade
{
public int score;
public int judge;
} }
}