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📁 经典C++程序设计100例 经典C++程序设计100例 经典C++程序设计100例
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            <td>当前位置：首页 >> 数据结构 >> 经典c程序100例 >> 正文</td>
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            <td height="40" align="center" bgcolor="eeeeee"><font style="font-size:16px"><b>经典c程序100例==41--50</b></font></td>
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            <td align="right"><font color="#999999">来源：<font color="#CC0000">郴州人才网</font> 
                时间：2004年10月27日8:10</font></td>
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            <td class=c><font id="zoom" style="font-size:14px"><P><FONT color=#990000>【程序41】</FONT><BR>题目：学习static定义静态变量的用法　　　<BR>1.程序分析：<BR>2.程序源代码：<BR>#include "stdio.h"<BR>varfunc()<BR>{<BR>int var=0;<BR>static int static_var=0;<BR>printf("\40:var equal %d \n",var);<BR>printf("\40:static var equal %d \n",static_var);<BR>printf("\n");<BR>var++;<BR>static_var++;<BR>}<BR>void main()<BR>{int i;<BR>　 for(i=0;i&lt;3;i++)<BR>　　 varfunc();<BR>}<BR>==============================================================<BR><FONT color=#990000>【程序42】</FONT> <BR>题目：学习使用auto定义变量的用法<BR>1.程序分析：　　　　　　<BR>2.程序源代码：<BR>#include "stdio.h"<BR>main()<BR>{int i,num;<BR>num=2;<BR>　 for (i=0;i&lt;3;i++)<BR>　 { printf("\40: The num equal %d \n",num);<BR>　　 num++;<BR>　　 {<BR>　　 auto int num=1;<BR>　　 printf("\40: The internal block num equal %d \n",num);<BR>　　 num++;<BR>　　 }<BR>　 }<BR>}<BR>==============================================================<BR><FONT color=#990000>【程序43】</FONT><BR>题目：学习使用static的另一用法。　　　<BR>1.程序分析：<BR>2.程序源代码：<BR>#include "stdio.h"<BR>main()<BR>{<BR>int i,num;<BR>num=2;<BR>for(i=0;i&lt;3;i++)<BR>{<BR>printf("\40: The num equal %d \n",num);<BR>num++;<BR>{<BR>static int num=1;<BR>printf("\40:The internal block num equal %d\n",num);<BR>num++;<BR>}<BR>}<BR>}<BR>==============================================================<BR><FONT color=#990000>【程序44】</FONT><BR>题目：学习使用external的用法。<BR>1.程序分析：<BR>2.程序源代码：<BR>#include "stdio.h"<BR>int a,b,c;<BR>void add()<BR>{ int a;<BR>a=3;<BR>c=a+b;<BR>}<BR>void main()<BR>{ a=b=4;<BR>add();<BR>printf("The value of c is equal to %d\n",c);<BR>}<BR>==============================================================<BR><FONT color=#990000>【程序45】</FONT><BR>题目：学习使用register定义变量的方法。<BR>1.程序分析：<BR>2.程序源代码：<BR>void main()<BR>{<BR>register int i;<BR>int tmp=0;<BR>for(i=1;i&lt;=100;i++)<BR>tmp+=i;<BR>printf("The sum is %d\n",tmp);<BR>}<BR>==============================================================<BR><FONT color=#990000>【程序46】</FONT><BR>题目：宏#define命令练习(1)　　　<BR>1.程序分析：<BR>2.程序源代码：<BR>#include "stdio.h"<BR>#define TRUE 1<BR>#define FALSE 0<BR>#define SQ(x) (x)*(x)<BR>void main()<BR>{<BR>int num;<BR>int again=1;<BR>printf("\40: Program will stop if input value less than 50.\n");<BR>while(again)<BR>{<BR>printf("\40:Please input number==&gt;");<BR>scanf("%d",&amp;num);<BR>printf("\40:The square for this number is %d \n",SQ(num));<BR>if(num&gt;=50)<BR>　 again=TRUE;<BR>else<BR>　 again=FALSE;<BR>}<BR>}<BR>==============================================================<BR><FONT color=#990000>【程序47】</FONT><BR>题目：宏#define命令练习(2)<BR>1.程序分析：　　　　　　　　　　　　<BR>2.程序源代码：<BR>#include "stdio.h"<BR>#define exchange(a,b) { \ /*宏定义中允许包含两道衣裳命令的情形，此时必须在最右边加上"\"*/<BR>　　　　　　　　　　　　 int t;\<BR>　　　　　　　　　　　　 t=a;\<BR>　　　　　　　　　　　　 a=b;\<BR>　　　　　　　　　　　　 b=t;\<BR>　　　　　　　　　　　 }<BR>void main(void)<BR>{<BR>int x=10;<BR>int y=20;<BR>printf("x=%d; y=%d\n",x,y);<BR>exchange(x,y);<BR>printf("x=%d; y=%d\n",x,y);<BR>}<BR>==============================================================<BR><FONT color=#990000>【程序48】</FONT><BR>题目：宏#define命令练习(3)　　　<BR>1.程序分析：<BR>2.程序源代码：<BR>#define LAG &gt;<BR>#define SMA &lt;<BR>#define EQ ==<BR>#include "stdio.h"<BR>void main()<BR>{ int i=10;<BR>int j=20;<BR>if(i LAG j)<BR>printf("\40: %d larger than %d \n",i,j);<BR>else if(i EQ j)<BR>printf("\40: %d equal to %d \n",i,j);<BR>else if(i SMA j)<BR>printf("\40:%d smaller than %d \n",i,j);<BR>else<BR>printf("\40: No such value.\n");<BR>}<BR>==============================================================<BR><FONT color=#990000>【程序49】</FONT><BR>题目：#if #ifdef和#ifndef的综合应用。<BR>1. 程序分析： <BR>2.程序源代码：<BR>#include "stdio.h"<BR>#define MAX<BR>#define MAXIMUM(x,y) (x&gt;y)?x:y<BR>#define MINIMUM(x,y) (x&gt;y)?y:x<BR>void main()<BR>{ int a=10,b=20;<BR>#ifdef MAX<BR>printf("\40: The larger one is %d\n",MAXIMUM(a,b));<BR>#else<BR>printf("\40: The lower one is %d\n",MINIMUM(a,b));<BR>#endif<BR>#ifndef MIN<BR>printf("\40: The lower one is %d\n",MINIMUM(a,b));<BR>#else<BR>printf("\40: The larger one is %d\n",MAXIMUM(a,b));<BR>#endif<BR>#undef MAX<BR>#ifdef MAX<BR>printf("\40: The larger one is %d\n",MAXIMUM(a,b));<BR>#else<BR>printf("\40: The lower one is %d\n",MINIMUM(a,b));<BR>#endif<BR>#define MIN<BR>#ifndef MIN<BR>printf("\40: The lower one is %d\n",MINIMUM(a,b));<BR>#else<BR>printf("\40: The larger one is %d\n",MAXIMUM(a,b));<BR>#endif<BR>}<BR>==============================================================<BR><FONT color=#990000>【程序50】</FONT><BR>题目：#include 的应用练习　　　<BR>1.程序分析：<BR>2.程序源代码：<BR>test.h 文件如下：<BR>#define LAG &gt;<BR>#define SMA &lt;<BR>#define EQ ==<BR>#include "test.h" /*一个新文件50.c，包含test.h*/<BR>#include "stdio.h"<BR>void main()<BR>{ int i=10;<BR>int j=20;<BR>if(i LAG j)<BR>printf("\40: %d larger than %d \n",i,j);<BR>else if(i EQ j)<BR>printf("\40: %d equal to %d \n",i,j);<BR>else if(i SMA j)<BR>printf("\40:%d smaller than %d \n",i,j);<BR>else<BR>printf("\40: No such value.\n");<BR>}</P> </font><br>
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