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    <TD width="100%"><FONT color=#ff9933><B><FONT color=#3300cc 
      size=5>经典c程序100例==41--50</FONT></B></FONT>
      <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>
      <P>　</P></TD></TR></TBODY></TABLE></CENTER></DIV></BODY></HTML>

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