c语言经典程序100例.htm

文件包含100个经典C语言程序文件

<P>/* 如果使用的是TC系列编译器则可能需要添加下句 */<BR>static void dummyfloat(float *x){ float y; 
dummyfloat(&amp;y);}</P>
<P>main()<BR>{<BR>float a[3][3],sum=0;<BR>int i,j;<BR>printf("please input 
rectangle 
element:\n");<BR>for(i=0;i&lt;3;i++)<BR>for(j=0;j&lt;3;j++)<BR>scanf("%f",&amp;a[i][j]);<BR>for(i=0;i&lt;3;i++)<BR>sum=sum+a[i][i];<BR>printf("duijiaoxian 
he is 
%6.2f",sum);<BR>getch();<BR>}<BR>==============================================================<BR>【程序39】<BR>题目：有一个已经排好序的数组。现输入一个数，要求按原来的规律将它插入数组中。<BR>1. 
程序分析：首先判断此数是否大于最后一个数，然后再考虑插入中间的数的情况，插入后<BR>　　　　　此元素之后的数，依次后移一个位置。 
<BR>2.程序源代码：<BR>#include "stdio.h"<BR>#include "conio.h"<BR>main()<BR>{<BR>int 
a[11]={1,4,6,9,13,16,19,28,40,100};<BR>int 
temp1,temp2,number,end,i,j;<BR>printf("original array 
is:\n");<BR>for(i=0;i&lt;10;i++)<BR>printf("%5d",a[i]);<BR>printf("\n");<BR>printf("insert 
a new 
number:");<BR>scanf("%d",&amp;number);<BR>end=a[9];<BR>if(number&gt;end)<BR>a[10]=number;<BR>else<BR>{<BR>for(i=0;i&lt;10;i++)<BR>{<BR>if(a[i]&gt;number)<BR>{<BR>temp1=a[i];<BR>a[i]=number;<BR>for(j=i+1;j&lt;11;j++)<BR>{<BR>temp2=a[j];<BR>a[j]=temp1;<BR>temp1=temp2;<BR>}<BR>break;<BR>}<BR>}<BR>}<BR>for(i=0;i&lt;11;i++)<BR>printf("%6d",a[i]);<BR>getch();<BR>}<BR>==============================================================<BR>【程序40】<BR>题目：将一个数组逆序输出。<BR>1.程序分析：用第一个与最后一个交换。<BR>2.程序源代码：<BR>#include 
"stdio.h"<BR>#include "conio.h"<BR>#define N 5<BR>main()<BR>{<BR>int 
a[N]={9,6,5,4,1},i,temp;<BR>printf("\n original 
array:\n");<BR>for(i=0;i&lt;N;i++)<BR>printf("%4d",a[i]);<BR>for(i=0;i&lt;N/2;i++)<BR>{<BR>temp=a[i];<BR>a[i]=a[N-i-1];<BR>a[N-i-1]=temp;<BR>}<BR>printf("\n 
sorted 
array:\n");<BR>for(i=0;i&lt;N;i++)<BR>printf("%4d",a[i]);<BR>getch();<BR>}</P>
<P><BR>　　　　经典c程序100例==41--50<BR>【程序41】<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>#include "conio.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>{<BR>int 
i;<BR>for(i=0;i&lt;3;i++)<BR>varfunc();<BR>getch();<BR>}<BR>==============================================================<BR>【程序42】 
<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>#include "conio.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>auto int num=1;<BR>printf("\40: The internal block 
num equal %d 
\n",num);<BR>num++;<BR>}<BR>}<BR>getch();<BR>}<BR>==============================================================<BR>【程序43】<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>#include "conio.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>getch();<BR>}<BR>==============================================================<BR>【程序44】<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>#include "conio.h"<BR>int a,b,c;<BR>void add()<BR>{<BR>int 
a;<BR>a=3;<BR>c=a+b;<BR>}<BR>void main()<BR>{<BR>a=b=4;<BR>add();<BR>printf("The 
value of c is equal to 
%d\n",c);<BR>getch();<BR>}<BR>==============================================================<BR>【程序45】<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>#include 
"stdio.h"<BR>#include "conio.h"<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>getch();<BR>}<BR>==============================================================<BR>【程序46】<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>#include "conio.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>getch();<BR>}<BR>==============================================================<BR>【程序47】<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>#include 
"conio.h"<BR>/*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>#define exchange(a,b) { 
\<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>getch();<BR>}<BR>==============================================================<BR>【程序48】<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>#include 
"conio.h"<BR>void main()<BR>{<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>getch();<BR>}<BR>==============================================================<BR>【程序49】<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>#include 
"conio.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>{<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>getch();<BR>}<BR>==============================================================<BR>【程序50】<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 ==</P>
<P>主文件如下:<BR>#include "test.h" /*一个新文件50.c，包含test.h*/<BR>#include 
"stdio.h"<BR>#include "conio.h"<BR>void main()<BR>{<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>getch();<BR>}</P>
<P><BR>　　　　经典c程序100例==51--60<BR>【程序51】<BR>题目：学习使用按位与 &amp; 
。　　　<BR>1.程序分析：0&amp;0=0; 0&amp;1=0; 1&amp;0=0; 
1&amp;1=1<BR>2.程序源代码：<BR>#include "stdio.h"<BR>main()<BR>{<BR>int 
a,b;<BR>a=077;<BR>b=a&amp;3;<BR>printf("\40: The a &amp; b(decimal) is %d 
\n",b);<BR>b&amp;=7;<BR>printf("\40: The a &amp; b(decimal) is %d 
\n",b);<BR>}<BR>==============================================================<BR>【程序52】<BR>题目：学习使用按位或 
| 。<BR>1.程序分析：0|0=0; 0|1=1; 1|0=1; 1|1=1　　　　　　　　　　　　<BR>2.程序源代码：<BR>#include 
"stdio.h"<BR>main()<BR>{<BR>int a,b;<BR>a=077;<BR>b=a|3;<BR>printf("\40: The a 
&amp; b(decimal) is %d \n",b);<BR>b|=7;<BR>printf("\40: The a &amp; b(decimal) 
is %d 
\n",b);<BR>}<BR>==============================================================<BR>【程序53】<BR>题目：学习使用按位异或 
^ 。　　　<BR>1.程序分析：0^0=0; 0^1=1; 1^0=1; 1^1=0<BR>2.程序源代码：<BR>#include 
"stdio.h"<BR>main()<BR>{<BR>int a,b;<BR>a=077;<BR>b=a^3;<BR>printf("\40: The a 
&amp; b(decimal) is %d \n",b);<BR>b^=7;<BR>printf("\40: The a &amp; b(decimal) 
is %d 
\n",b);<BR>}<BR>==============================================================<BR>【程序54】<BR>题目：取一个整数a从右端开始的4～7位。<BR>程序分析：可以这样考虑： 
<BR>(1)先使a右移4位。<BR>(2)设置一个低4位全为1,其余全为0的数。可用~(~0&lt;&lt;4)<BR>(3)将上面二者进行&amp;运算。<BR>2.程序源代码：<BR>main()<BR>{<BR>unsigned 
a,b,c,d;<BR>scanf("%o",&amp;a);<BR>b=a&gt;&gt;4;<BR>c=~(~0&lt;&lt;4);<BR>d=b&amp;c;<BR>printf("%o\n%o\n",a,d);<BR>}<BR>==============================================================<BR>【程序55】<BR>题目：学习使用按位取反~。　　　<BR>1.程序分析：~0=1; 
~1=0;<BR>2.程序源代码：<BR>#include "stdio.h"<BR>main()<BR>{<BR>int 
a,b;<BR>a=234;<BR>b=~a;<BR>printf("\40: The a's 1 complement(decimal) is %d 
\n",b);<BR>a=~a;<BR>printf("\40: The a's 1 complement(hexidecimal) is %x 
\n",a);<BR>} 
<BR>==============================================================<BR>【程序56】<BR>题目：画图，学用circle画圆形。　　　<BR>1.程序分析：<BR>2.程序源代码：<BR>/*circle*/<BR>#include 
"graphics.h"<BR>main()<BR>{int driver,mode,i;<BR>float 
j=1,k=1;<BR>driver=VGA;mode=VGAHI;<BR>initgraph(&amp;driver,&amp;mode,"");<BR>setbkcolor(YELLOW);<BR>for(i=0;i&lt;=25;i++)<BR>{<BR>setcolor(8);<BR>circle(310,250,k);<BR>k=k+j;<BR>j=j+0.3;<BR>}<BR>} 
<BR>==============================================================<BR>【程序57】<BR>题目：画图，学用line画直线。<BR>1.程序分析：　　　　　　　　　　　<BR>2.程序源代码：<BR>#include