如何用c语言显示菱形

1

运用C语言程序输出一个菱形：

源代码为：

#include<stdio.h>

void main()

{

int n=6

int i,a,b

//前4行.上半部分

for( i=1i<=ni++)//控制行数

{

for(  a=n-1a>=ia--)//打印空格

{

printf(" ")

}

for(  b=1b<=2*i-1b++)//打印*

{

printf("*")

}

printf("\n")

}

//后3行,下半部分

for( i=n-1i>=1i--)

{

for( a=ia<=n-1a++)

{

printf(" ")

}

for( b=1b<=2*i-1b++)

{

printf("*")

}

printf("\n")

}

}

2

这是菱形上半部分的代码：

//菱形的上半部分

for( i=1i<=ni++)//控制行数

{

for(  a=n-1a>=ia--)//输出空格

{

printf(" ")

}

for(  b=1b<=2*i-1b++)//输出*

{

printf("*")

}

printf("\n")

}

3

这是菱形下半部分的代码：

//菱形 的下半部分

for( i=n-1i>=1i--)

{

for( a=ia<=n-1a++)

{

printf(" ")

}

for( b=1b<=2*i-1b++)

{

printf("*")

}

printf("\n")

}

4

此程序中值得注意的地方

这个程序的源代码，主要是运用了for语句的循环嵌套。for语句的一般形式为：

for(循环变量赋初值；循环条件；循环变量增值)      {语句}    

当一或二条件知识一个分号代表：此条件一直为真，一直成立！

5

存C语言的格式：

程序文件有：源程序文件（后缀为    .c）、目标文件（ 后缀为    .obj）、可执行文件（后缀为   .exe），当后缀名错误时，则程序不能执行。平常我们 写的代码就是源程序文件，所以保存时用  .c  ，程序会自动 生成目标文件  .obj  ,再到执行文件  .exe  .然后执行得到结果。

6

对C语言一定要重视，因为它会在你未来的工作中，帮你许多的忙。

for(i=1i<=4i++)

{

这个小的for是打印每一行前边的空格

for(j=1j<=4-ij++)

System.out.print(" ")

这个是打印星星的

for(j=1j<=2*i-1j++)

System.out.print("*")

这个是打印完一行的换行

System.out.println("")

}

下边的是一样的  只不过每一行的空格和星星数   和上边是翻过来的

for(i=1i<=3i++)

{

for(j=1j<=ij++)

System.out.print(" ")

for(j=1j<=7-2*ij++)

System.out.print("*")

System.out.println("")

}

java.sql.SQLException: 无效的列索引

无效的列索引

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:207)

atoracle.jdbc.driver.OraclePreparedStatement.setStringInternal(OraclePreparedStatement.java:5328)

atoracle.jdbc.driver.OraclePreparedStatement.setString(OraclePreparedStatement.java:5320)

at untitled5.addreader1.validID(addreader1.java:128)

at untitled5.addreader1.jButton1_actionPerformed(addreader1.java:97)

at untitled5.addreader1_jButton1_actionAdapter.actionPerformed(addreader1.java:175)

at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)

at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)

at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)

at javax.swing.DefaultButtonModel.setPressed(Unknown Source)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)

at java.awt.Component.processMouseEvent(Unknown Source)

at javax.swing.JComponent.processMouseEvent(Unknown Source)

at java.awt.Component.processEvent(Unknown Source)

at java.awt.Container.processEvent(Unknown Source)

at java.awt.Component.dispatchEventImpl(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)

at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source

at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Window.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)

代码：String driverName = "oracle.jdbc.OracleDriver"

Driver driver = (Driver) Class.forName(driverName).newInstance()

//连接数据库

Connection con = DriverManager.getConnection(

"jdbc:oracle:thin:@LONG:1521:orcl", "sysman", "tongfang")

PreparedStatement pstmt = con.prepareStatement(

" insert into reader values(?)")

pstmt.setString(1, str1)

pstmt.setString(2,str2)

pstmt.setString(3,str3)

pstmt.setString(4,str4)

ResultSet res = pstmt.executeQuery()

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