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{ FILE *fp;<br>
char ch,filename[10];<br>
scanf("%s",filename);<br>
if((fp=fopen(filename,"w"))==NULL)<br>
{printf("cannot open file\n");<br>
exit(0);}<br>
ch=getchar();<br>
ch=getchar();<br>
while(ch!='#')<br>
{fputc(ch,fp);putchar(ch);<br>
ch=getchar();<br>
}<br>
fclose(fp);<br>
}<br>
==============================================================<br>
<font color="#990000">【程序98】</font><br>
题目：从键盘输入一个字符串，将小写字母全部转换成大写字母，然后输出到一个磁盘文件“test”中保存。<br>
输入的字符串以！结束。 <br>
1.程序分析：<br>
2.程序源代码：<br>
#include "stdio.h"<br>
main()<br>
{FILE *fp;<br>
char str[100],filename[10];<br>
int i=0;<br>
if((fp=fopen("test","w"))==NULL)<br>
{ printf("cannot open the file\n");<br>
exit(0);}<br>
printf("please input a string:\n");<br>
gets(str);<br>
while(str[i]!='!')<br>
{ if(str[i]>='a'&&str[i]<='z')<br>
str[i]=str[i]-32;<br>
fputc(str[i],fp);<br>
i++;}<br>
fclose(fp);<br>
fp=fopen("test","r");<br>
fgets(str,strlen(str)+1,fp);<br>
printf("%s\n",str);<br>
fclose(fp);<br>
}<br>
==============================================================<br>
<font color="#990000">【程序99】</font><br>
题目：有两个磁盘文件A和B,各存放一行字母，要求把这两个文件中的信息合并（按字母顺序排列）， <br>
输出到一个新文件C中。<br>
1.程序分析：<br>
2.程序源代码：<br>
#include "stdio.h"<br>
main()<br>
{ FILE *fp;<br>
int i,j,n,ni;<br>
char c[160],t,ch;<br>
if((fp=fopen("A","r"))==NULL)<br>
{printf("file A cannot be opened\n");<br>
exit(0);}<br>
printf("\n A contents are :\n");<br>
for(i=0;(ch=fgetc(fp))!=EOF;i++)<br>
{c[i]=ch;<br>
putchar(c[i]);<br>
}<br>
fclose(fp);<br>
ni=i;<br>
if((fp=fopen("B","r"))==NULL)<br>
{printf("file B cannot be opened\n");<br>
exit(0);}<br>
printf("\n B contents are :\n");<br>
for(i=0;(ch=fgetc(fp))!=EOF;i++)<br>
{c[i]=ch;<br>
putchar(c[i]);<br>
}<br>
fclose(fp);<br>
n=i;<br>
for(i=0;i<n;i++)<br>
for(j=i+1;j<n;j++)<br>
if(c[i]>c[j])<br>
{t=c[i];c[i]=c[j];c[j]=t;}<br>
printf("\n C file is:\n");<br>
fp=fopen("C","w");<br>
for(i=0;i<n;i++)<br>
{ putc(c[i],fp);<br>
putchar(c[i]);<br>
}<br>
fclose(fp);<br>
}<br>
==============================================================<br>
<font color="#990000">【程序100】</font><br>
题目：有五个学生，每个学生有3门课的成绩，从键盘输入以上数据（包括学生号，姓名，三门课成绩），计算出<br>
平均成绩，况原有的数据和计算出的平均分数存放在磁盘文件"stud"中。<br>
1.程序分析：<br>
2.程序源代码：<br>
#include "stdio.h"<br>
struct student<br>
{ char num[6];<br>
char name[8];<br>
int score[3];<br>
float avr;<br>
} stu[5];<br>
main()<br>
{int i,j,sum;<br>
FILE *fp;<br>
/*input*/<br>
for(i=0;i<5;i++)<br>
{ printf("\n please input No. %d score:\n",i);<br>
printf("stuNo:");<br>
scanf("%s",stu[i].num);<br>
printf("name:");<br>
scanf("%s",stu[i].name);<br>
sum=0;<br>
for(j=0;j<3;j++)<br>
{ printf("score %d.",j+1);<br>
scanf("%d",&stu[i].score[j]);<br>
sum+=stu[i].score[j];<br>
}<br>
stu[i].avr=sum/3.0;<br>
}<br>
fp=fopen("stud","w");<br>
for(i=0;i<5;i++)<br>
if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1)<br>
printf("file write error\n");<br>
fclose(fp);<br>
}</p>
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<li><font color=#0772B1>上篇文章</font>：<a href="list.asp?id=211">经典c程序100例==81--90 </a>
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经典c程序100例==91--100
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<td width="87%" align=center> 辽宁省铁岭师专c语言研究中心 <u>杨志锋</u> 数学系 <u>杜博</u> </td>
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