[例11.1] 将键盘输入的一行字符存入d盘的myfile1.txt文件中。

#include <stdio.h>

main()

{ FILE *out_fp;

char ch;

if((out_fp=fopen("d:\\myfile1.txt","w"))==NULL)

{ printf("不能建立d:\\myfile1.txt文件。\n");

exit(1);

}

while((ch=getchar())!='\n')

fputc(ch,out_fp);

close(out_fp);

}

[例11.2] 将例11.1建立的d:\myfile1.txt文本文件中的字符，全部显示在屏幕上，并统计总共有多少个字符。

#include <stdio.h>

main()

{ FILE *in_fp;

char ch;

int n=0;

if((in_fp=fopen("d:\\myfile1.txt","r"))==NULL)

{ printf("不能读取d:\\myfile1.txt文件。\n");

exit(1);

}

while((ch=fgetc(in_fp))!=EOF) /* 文本文件没结束时 */

{ putchar(ch);

n++;

}

close(in_fp);

printf("\n共读入了 %d 个字符。\n",n);

}

例11.3 文件复制

#include <stdio.h>

main()

{ FILE *from_fp,*to_fp;

char from_filename[80],to_filename[80],ch;

printf("源文件名：");scanf("%s",from_filename);

printf("目标文件名：");scanf("%s",to_filename);

if((from_fp=fopen(from_filename,"rb")==NULL) /* 只读打开二进制文件 */

{ printf("%s源文件无法使用。\n",from_filename);

exit(1);

}

if((to_fp=fopen(to_filename,"wb"))==NULL) /* 只写打开二进制文件 */

{ printf("%s目标文件无法创建。\n",to_filename);

exit(1);

}

while(!feof(from_filename)) /* 源二进制文件没结束时 */

{ ch=fgetc(from_filename);

fputc(ch,to_filename);

}

fclose(from_filename);

fclose(to_filename);

}

例11.4 将一批字符串写入文件

#include <stdio.h>

main()

{ FILE *f;

char *str[]={"red","blue","yellow","green","black"};

int i;

f=fopen("d:\\myfile4.txt","w");

for(i=0;i<5;i++)

fputs(str[i],f);

fclose(f);

}

例11.5 将MyDoc.txt文本文件的内容显示在屏幕上。该文本文件由许多行组成，并且每一行的最大长度不超过1024个字符。

#include <stdio.h>

#define MaxChars 1024

main()

{ FILE *f;

char str[MaxChars];

f=fopen("d:\\MyDoc.txt","r");

while(fgets(str,MaxChars,f))

printf("%s",str);

fclose(f);

}