文件问题：不能正确显示printf，为什么？

[shuirh]

#include<stdio.h>

main()
{
FILE *fp;
char buffer[10]="beijing";

if((fp=fopen("testfile.txt","w"))==NULL)
{
printf("can't open file\n");
exit(1);
}

if(fwrite(buffer,strlen(buffer),1,fp)!=1)
{
printf("write file failed\n");
exit(1);
}

if(fread(buffer,strlen(buffer),1,fp)!=1)
{
printf("read file failed\n");
exit(1);
}

printf("%s\n",buffer);

fclose(fp);

}

屏幕上显示 屯屯屯 testfile.txt中显示 beijing屯屯屯
这是为什么？？？？

[baihacker]

fopen("testfile.txt","w")

见你的打开模式.

一般是关了后重新以读模式打开.

弄成wr也可以,不过有些问题要注意的.

[lann64]

呵呵，以后小心点。读文件用r模式

[baihacker]

#include <stdio.h> 
#include <stdlib.h>
#include <string.h>
main() 
{ 
FILE *fp; 
char buffer[10]="beijing"; 

if((fp=fopen("testfile.txt","w"))==NULL) 
{ 
printf("can't open file\n"); 
exit(1); 
} 

if(fwrite(buffer,strlen(buffer),1,fp)!=1) 
{ 
printf("write file failed\n"); 
exit(1); 
} 
fclose(fp);
if((fp=fopen("testfile.txt","r"))==NULL) 
{ 
printf("can't open file\n"); 
exit(1); 
} 
if(fread(buffer,strlen(buffer),1,fp)!=1) 
{ 
printf("read file failed\n"); 
exit(1); 
} 

printf("%s\n",buffer); 

fclose(fp); 

} 

[shuirh]

哦，明白了，谢谢大家了。