【求助】SUSE linux 下文件拷贝程序的问题

choki

#include <stdio.h> int main(void) {    FILE *instream,*outstream;    /* open a file for reading */    if( (instream = fopen("file1.txt", "r")) == NULL )    {       printf("open in file err!\n");       exit(-1);    }    if( (outstream = fopen("file3.txt", "w+")) == NULL )    {       printf("open out file err!\n");       exit(-1);    }    /* read a character from the file */    while( ! feof(instream) ) /* check for EOF */    {        fputc(fgetc(instream),outstream);    }        printf("We have reached end-of-file\n");    /* close the file */    fclose(instream);    fclose(outstream);    return 0; }

file1.txt 内容：
1: line1!
2: line2!
3: line3!
4: line4!

file3.txt内容：
1: line1!
2: line2!
3: line3!
4: line4!
[

xjtdy888

feof是在文件结束了才会返回真的，所以多写入了一个EOF字符

xjtdy888

把代码改一下，判断一下是否读到了EOF这符 不过这段代码还是有问题的，如果读出的字符和EOF的值相同while将跳出可能拷不全

#include <stdio.h> #include <stdlib.h> int main(void) {    FILE *instream,*outstream;    char ch;    /* open a file for reading */    if( (instream = fopen("c.c", "r")) == NULL )    {       printf("open in file err!\n");       exit(-1);    }    if( (outstream = fopen("file3.txt", "w+")) == NULL )    {       printf("open out file err!\n");       exit(-1);    }    /* read a character from the file */    while((ch=fgetc(instream))!=EOF) fputc(ch,outstream);    //while((ch=fputc(fgetc(instream),outstream))    printf("We have reached end-of-file\n");    /* close the file */    fclose(instream);    fclose(outstream);    return 0; }

[ 本帖最后由 xjtdy888 于 2007-10-11 16:39 编辑 ]

choki

3x ， xjtdy888