C#练习代码

using System;
class Program
{
    static void Main()
    {
        Console.WriteLine("请输入两个整数:");
        int a = Convert.ToInt32(Console.ReadLine());//Console.ReadLine()默认读取字符串
        int b = Convert.ToInt32(Console.ReadLine());//Console.ToInt32()将读到的字符转换为带符号的32位整数
        int c = a + b;
        Console.WriteLine("两数之和是:" + c);
        Console.ReadLine();
    }
}

using System;
class Program
{
    static void Main()
    {
        short a = 32767;
        a = a + (short)1;
        Console.WriteLine(a);
    }
}

using System;
class Program
{
    static void Main()
    {
        int o = sizeof(byte);
        int a = sizeof(char);
        int b = sizeof(short);
        int c = sizeof(int);
        int d = sizeof(long);
        Console.WriteLine("在32位环境中字节型数所占的字节数为:" + o);
        Console.WriteLine("在32位环境中字节型数所占的字节数为:" + a);
        Console.WriteLine("在32位环境中字节型数所占的字节数为:" + b);
        Console.WriteLine("在32位环境中字节型数所占的字节数为:" + c);
        Console.WriteLine("在32位环境中字节型数所占的字节数为:" + d);
    }
}

Convert.ToInt32("213145");//用Convert类将一个.NET基本数据类型转换成另一个.NET基本数据类型

int a=12345;
string sn=a.ToString();//把a转换成字符串sn
int b=int.Parse(sn);//把sn转换成整数b,结果b=a

//数据发生阶段示例
using System;
class Program
{
    static void Main()
    {
        short i = 289;
        byte b;
        b = (byte)i;
        char c = (char)b;
        Console.WriteLine("{0}", c);
    }
}

using System;
class Program
{
    static void Main()
    {
        int a = 12;
        a -= a * a;
        a += a;
        Console.WriteLine("a={0}", a);
    }
}

using System;
class Program
{
    static void Main()
    {
        bool a = true;
        bool b = 5 < 3 && 7 > 4 || 8 > 5;
        int c = Convert.ToInt32(a && b);
        Console.WriteLine("c={0}", c);
    }
}//1

using System;
class Program{
    static void Main(){
        int a=10,b=20,c=30;
        bool m=(a<b&&b>c||a<b);
        Console.WriteLine(m);
    }
}//true

using System;
class Program
{
    static void Main()
    {
        Console.Write("请输入第一个整数:");
        int a = Convert.ToInt32(Console.ReadLine());
        Console.Write("请输入第二个整数:");
        int b = Convert.ToInt32(Console.ReadLine());
        int max = a > b ? a : b;
        Console.WriteLine("两个整数的较大数是:{0}", max);
    }
}

using System;
class Program
{
    static void Main()
    {
        bool b1 = false;
        Console.Write("请输入第一个数:");
        int m = Convert.ToInt32(Console.ReadLine());
        Console.Write("请输入第二个数:");
        int n = Convert.ToInt32(Console.ReadLine());
        b1 = m >= n ? true : false;
        Console.WriteLine("结果为:" + b1);
    }
}

using System;
class Program
{
    static void Main()
    {
        Console.Write("请输入一个整数:");
        int x = Convert.ToInt32(Console.ReadLine());
        bool m = x > 0 && x <= 100 ? true : false;
        Console.WriteLine("{0}", m);
    }
}

template <class T, class T1 =  int, class T2 = int> class A;


template<class T, class T1 , class  T2 >
class  A
{


};


class B: public A<B,  int>
{

};
int main(int argc, char* argv[])
{


B b;


return 0;
}


using System;
class Program
{
    static void Main()
    {
        int a = 240;
        int b = -16;
        int c = 44;
        Console.WriteLine("a={0}右移二位 a={1}", a, a >> 2);
        Console.WriteLine("b={0}右移二位 b={1}", b, b >> 2);
        Console.WriteLine("c={0}左移二位 c={1}", c, c << 2);
    }
}

using System;
class Program
{
    static void Main()
    {
        int a = 7, b = 2;
        int c = a % b++;
        int d = -b;
        int e = b / (3 + a);
        int f = d + e - c;
        Console.WriteLine("f={0}", f);
    }
}

//十进制，十六进制
using System;
class Program
{
    static void Main()
    {
        int number = 1001;
        Console.WriteLine("十进制:{0:1}", number);
        Console.WriteLine("十六进制:{0:X}", number);
        Console.Write("{0,5}", 25);//三个空格
        Console.Write("{0:D5}", 25);//
    }
}

//talkback.c--一个能为你提供一些信息的对话框
#include<stdio.h>

#include<string.h>

#define DENSITY 62.4

int main()
{

	float weight, volume;

	int size, letters, m;

	char name[40];

	printf("Hi! What's your first name?\n");

	scanf("%s",name);

	printf("%s, what'syour weight in pounds?\n",name);

	scanf("%f",&weight);

	size = sizeof name;

	letters = strlen (name);

	volume = weight / DENSITY;

	printf("well, %s, your volume is %2.2f cubic feet.\n",name, volume);

	printf("alsso, your first name has %d letters, \n",letters);

	printf("and we have %d bytes to store it in.\n",size);

	getchar();

	return 0;
}

using System;
class Program
{
    static void Main()
    {
        Console.Write("请输入一个年份:");
        string str = Console.ReadLine();
        int year = Int32.Parse(str);
        bool isleapyear = ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0));
        string yesno = isleapyear ? "是" : "不是";
        Console.WriteLine("{0}年{1}闰年", year, yesno);
    }
}

using System;
class Program
{
    static void Main()
    {
        Console.Write("请输入一个年份:");
        string str = Console.ReadLine();
        int year = Int32.Parse(str);
        if ((year % 4 == 0) && (year % 100 != 0) || (year % 400) == 0)
            Console.WriteLine("{0}年时闰年", year);
        else
        {
            Console.WriteLine("{0}年不是闰年", year);
        }
    }
}

using System;
class Program
{
    static void Main()
    {
        Console.Write("请输入一个整数分数:");
        int x = Convert.ToInt32(Console.ReadLine());
        if (x > 90)
            Console.WriteLine("优秀");
        else if (x > 80)
            Console.WriteLine("良好");
        else if (x > 70)
            Console.WriteLine("中等");
        else if (x > 60)
            Console.WriteLine("及格");
        else
            Console.WriteLine("不及格");
    }
}

using System;
class Program
{
    static void Main()
    {
        Console.Write("请输入一个分数:");
        string x = Console.ReadLine();
        int m = Int32.Parse(x);
        int c = m / 10;
        switch(c){
            case 9:
            case 10:Console.WriteLine("优秀");break;
            case 8:Console.WriteLine("良好");break;
            case 7:Console.WriteLine("一般");break;
            case 6:Console.WriteLine("较差");break;
            default:Console.WriteLine("差");break;
        }
    }
}

using System;
class Program
{
    static void Main()
    {
        int i = 1, sum = 0;
        while(i<=100)
        {
            sum += 1;
            i++;
        }
        Console.WriteLine("sum={0}", sum);
    }
}

using System;
class Program
{
    static void Main()
    {
        int digit;
        Console.Write("输入一个整数");
        string x = Console.ReadLine();
        int num = int.Parse(x);
        Console.Write("反向显示结果");
        while(num!=0)
        {
            digit = num % 10;
            num = num /10;
            Console.Write(digit);
        }
        Console.WriteLine();
    }
}