适合初学者学习的C#编程代码（最基本程序代码）
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace 作业题
{
class Program
{
static void Main(string[] args)
{
/* 1.计算b,当a>=100时b=a;当a<100时b=2*a-1.
double a, b;
a = double.Parse(Console.ReadLine());
if (a<=100)
b=2*a+1;
else
b=a;
Console.WriteLine ("请输入:{0},结果是:{1}",a,b);
2.将int类型转化为text类型
int a = 123;
TextBox1.Text = a.ToString();
3. 将char类型转化为int类型
char ch = '9';
int i = (int)ch;
Console.WriteLine(ch);
4.将str类型转化为int类型
string str = "123";
int i = int.Parse(str);
Console.WriteLine(str);
5.圆的面积和周长
const double PI = 3.14;
double r = double.Parse(Console.ReadLine());
double s = PI * r * r;
double L = 2 * PI * r;
Console.WriteLine("圆的面积是{0},圆的周长是{1}", s, L);
6.求绝对值
double x, y;
x = double.Parse(Console.ReadLine());
if (x >= 0)
y = x;
else
y = -x;
Console.WriteLine("{0}的绝对值是{1}", x, y);
7)久久乘法表倒过来
int i = 9;
while (i >= 1)
{
int j = 1;
while (j <= i)
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
j++;
}
Console.WriteLine(" ");
i--;
}
7)久久乘法表
int i=1;
while (i <= 9)
{
int j = 1;
while (j <= i)
{
Console.Write("{0}*{1}={2}", j, i, j * i);
j++;
}
Console.WriteLine(" ");
i++;
}
8)}用do--while语句计算从1到100的和
int n=1,sum=0;
do
{
sum+=n;
}
while(n++<100);
Console.WriteLine ("从1到100的和是{0}",sum );
Console.WriteLine ("n的值是{0}",n );
9)for循环从1加到100的和
int s = 0;
for (int i = 1; i <= 100; i++)
{
s = s + i;
}
Console.WriteLine(s);
10)久久乘法表(for循环)
for ( int i=1;i<= 9; i++)
{
for (int j = 1; j <= i; j++)
{
Console.Write("{0}*{1}={2} ", j, i, i * j);
}
Console.WriteLine(" ");
} */
/*int s = 0;
for ( i = 1; i < 100; i++)
{
if (i % 4 == 0)
continue;
s = s + i;
}
Console.WriteLine(s);
/*11)用*号来组成正三角形(正的)
Console.WriteLine("请输入行数:");
int line = int.Parse(Console.ReadLine());
int i = 1;
while (i <= line)
{
int k = i;
while (k<line)
{
Console.Write(" ");
k++;
}
int m = 1;
while (m <=2 * i - 1)
{
Console.Write("*");
m++;
}
Console.WriteLine(" ");
i++;
12)求一个数是素数还是别的(会了)
Console.Write("请输入一个正数;");
int i, s;
s = int.Parse(Console.ReadLine());
for (i = 2; i < s; i++)
{
if (s % i == 0) break;
}
if (i >= s)
Console.WriteLine("素数");
else
Console.WriteLine("不是素数");
/*13)阶乘(会了)
int q = int.Parse(Console.ReadLine());
int s = 1;
int i = 1;
while (i <= q)
{
s = s * i;
i++;
}
Console.WriteLine(s);
/*14)
int n = 1;
while (n <= 20)
{
Console.WriteLine("n={0}", n);
n++;
15)
int x, y = 0;
do
{
x = y++;
Console.WriteLine(x);
}
while (y <= 23);
16)效果:
* * * * *
* * * *
* * *
* *
*
Console.WriteLine("请输入行数:");
int line = int.Parse(Console.ReadLine());
int i = 1;
while (i <= line)
{
int k = i;
while (k < line)
{
Console.Write("*");
k++;
}
int m = 1;
while (m <= 2 * i - 1)
{
Console.Write(" ");
m++;
}
Console.WriteLine(" ");
i++;
17)效果:
*
* *
* * *
* * * *
* * * * *
Console.WriteLine("请输入行数:");
int line = int.Parse(Console.ReadLine());
int i = 1;
while (i <= line)
{
int k =line-1 ;
while (k>=0 )
{
Console.Write(" ");
k--;
}
int m = 1;
while (m <= 2 * i - 1)
{
Console.Write(" * ");
m++;
}
Console.WriteLine(" ");
i++;
18)效果:
* * * * * * *
* * * * *
* * *
*
Console.WriteLine("请输入行数:");
int line = int.Parse(Console.ReadLine());
int i =line;
while (i>0)
{
int k=i ;
while (k<line )
{
Console.Write(" ");
k++;
}
int m = 1;
while (m <= 2 * i - 1)
{
Console.Write("*");
m++;
}
Console.WriteLine(" ");
i--;
//19)
int a, b;
a = int.Parse(Console.ReadLine());
if (a < 100)
b = 2 * a + 1;
else
b = a;
Console.WriteLine(b);
int[] a=new int[5]{1,2,3,4,5};
Console.WriteLine(a);
while循环九九乘法表
int i = 1;
while (i <= 9 )
{ int j = 1;
while (j <= i)
{ Console.Write("{0}*{1}={2} ", j, i, j * i);
j++;
}
Console.WriteLine(" ");
i++;
for循环九九乘法表
for (int i=1; i<=9; i++)
{
for (int j=1; j<=i; j++)
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
}
Console.WriteLine(" ");
do while循环九九乘法表
int i = 1;
do
{
int j = 1;
do
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
j++;
} while (j <= i);
Console.WriteLine(" ");
i++;
} while (i < 10);
int i = 1;
do
{
int j = 1;
do
{
if (j * i < 10)
{
Console.Write("{0}*{1}=0{2} ", j, i, j * i);
j++;
}
else
{ Console.Write("{0}*{1}={2} ", j, i, j * i);
j++;
}
} while (j <= i);
Console.WriteLine(" ");
i++;
} while (i < 10);
int i = 1;
do
{
int j=1;
while (j<=i)
{
int s=j*i;
if (s<10)
{
Console.Write ("{0}*{1}=0{2}",j,i,s);
j++;}
else
{
Console.Write ("{0}*{1}={2}",j,i,s);
j++;
}
Console.WriteLine (" ");
i++;
}
while (i<10);
int i=1;
while (i<=9)
{
int j=1; while (j<=i)
{
Console.Write ("{0}*{1}={2} ",j,i,j*i);
j++;
}
Console .WriteLine (" ");
i++;
}
int i = 9;
while (i >= 1)
{
int j = 1;
while (j <= i)
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
j++;
}
Console.WriteLine(" ");
i--;
}
int a, b;
a = int.Parse(Console.ReadLine());
if (a <= 100)
b = 2 * a - 10;
else
b=3*a-9;
Console.WriteLine ("请输入:{0},结果是:{1}",a,b);*/
/*for (int i = 1; i <= 9; i++)
{
for (int j = 1; j <= i; j++)
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
}
Console.WriteLine(" ");
}
for(int i = 1; i <= 9; i++)
{
for (int j = 1; j <= i; j++)
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
}
Console.WriteLine(" ");
}
int a, b;
a = int.Parse(Console.ReadLine());
if (a <= 100)
b = 2 * a - 10;
else
b = 2 * a + 10;
Console.WriteLine("输入值为:{0},输出值为:{1}", a, b);
int i = 1;
while (i<=9)
{
int j=1;
while (j<=i)
{
Console .Write ("{0}*{1}={2} ",j,i,j*i);
j++;
}
Console .WriteLine (" ");
i++;
}
int i=1;
while (i <= 9)
{
int j = 1;
while (j <= i)
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
j++;
}
Console.WriteLine(" ");
i++;
}
int i = 1;
while (i <= 9)
{
int j=1;
while (j<=i)
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
j++;
}
Console .WriteLine (" ");
i++;
}
int m = int.Parse(Console.ReadLine());
int s=1;
int i=1;
while (i<=m)
{
s=s*i;
i++;}
Console.WriteLine("请输入值:{0},{0}的阶乘是:{1}", i, s);
int n = int.Parse(Console.ReadLine());
int i = 1;
int s = 1;
while (i <= n)
{
s = s * i;
i++;
}
Console.WriteLine("请输入:{0},{0}的阶乘结果是:{1}", i,s);
int i = 1;
do
{
int j = 1;
do
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
j++;
}
while (j <= i);
Console.WriteLine(" ");
i++;
}
while (i <= 9);
int i=1;
do
{
int j=1;
do
{
Console .Write ("{0}*{1}={2} ",j,i,j*i);
j++;
}
while (j<=i) ;
Console .WriteLine (" ");
i++;
}
while (i<=9);
int i = 1;
do
{
int j=1;
do
{
Console .Write ("{0}*{1}={2} ",j,i,j*i);
j++;
}
while (j<=i);
Console.WriteLine(" ");
i++;
}
while (i<=9);
int i = 1;
do
{
int j=1;
do
{
Console .Write ("{0}*{1}={2} ",j,i,j*i);
j++;
}
while (j<=i);
Console .WriteLine (" ");
i++;
}
while (i<=9);
int a, b;
a = int.Parse(Console.ReadLine());
if (a >= 0)
b = a;
else
b = -a;
Console.WriteLine("请输入:{0},{0}的绝对值是:{1}", a, b);*/
/*int i = 1;
do
{
int j = 1;
do
{
if (j * i < 10)
{
Console.Write("{0}*{1}=0{2} ", j, i, j * i);
j++;
}
else
{
Console.Write("{0}*{1}={2} ", j, i, j * i);
j++;
}
}
while (j <= i);
Console.WriteLine(" ");
i++;
}
while (i < 10);*/
int i = 1;
do
{
int j=1;
do
{
}
}
}
}
}
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