大家帮我看看下面这个读取文件的小程序有什么问题，谢了哈

[aa1298]

/* HELLO.C -- Hello, world */

#include "stdio.h"
#include "conio.h"

main()
{
float k;
float *p1=&k;
FILE *fp;
fp=fopen("file bcf","r");
fread(p1,8,1,fp);
printf("k is %f\n",k);
getch();

}



下面这个是文件名为 bcf.dat 的文件
1.0000000e+000 2.0000000e+000 3.0000000e+000 4.0000000e+000 5.0000000e+000 6.0000000e+000 7.0000000e+000 8.0000000e+000 9.0000000e+000 0.0000000e+000

[LinuxBirdMan]

文件路径都不对噢。。。文件后缀名也没。。。缓冲区最好定义一个数组。。。

[aa1298]

还有个问题 指针可以用double型的吗？

[LinuxBirdMan]

你要用char类型的数组。。。。。。。从文件里读出来的都是字符。。。不是数字。。。。

[witwolf]

fp=fopen("file bcf","r");把file bcf 改为bcf.bat

[LinuxBirdMan]

#include "stdio.h"
#include "conio.h"

main()
{
  char data[1024];
  memset(data, 0, 1024);
  FILE *fp;
  fp=fopen("file bcf","r");
  fread(data,1024,1,fp);
  printf("k is %f\n",k);
  getch();

}

[LinuxBirdMan]

#include "stdio.h"
#include "conio.h"

main()
{
  char data[15];
  memset(data, 0, 15);
  FILE *fp;
  fp=fopen("bcf.bat","r");
  fread(data,15,1,fp);
  //printf("k is %s\n",data);
  getch();

}

[AnYidan]

FILE *fopen(char *filename, char *openmode);

size_t fread(void *ptr, size_t size, size_t nobj, FILE *stream)

fread reads from stream into the array ptr at most nobj objects of size size. fread returns the number of objects read; this may be less than the number requested. feof and ferror must be used to determine status.

函数 fread 从 stream 中读入最多 nobj 个对象到 ptr 指向的数组中，每个对象的尺寸是 size

[yiyefangzhou24]

貌似问题很多[Quote=引用 6 楼 linuxbirdman 的回复:]
C/C++ code
#include "stdio.h"
#include "conio.h"

main()
{
char data[15];
memset(data, 0, 15);
FILE *fp;
fp=fopen("bcf.bat","r");
fread(data,15,1,fp);
//printf("k is %s\n",data)……
[/Quote]

[jialejiahi]

你就读一个数，干脆fscanf吧。

/* HELLO.C -- Hello, world */

#include "stdio.h"

int main()
{
	float k;
	float *p1=&k;
	FILE *fp;

	fp=fopen ("bcf.dat","r");
	fscanf (fp, "%e", p1);
	printf ("k is %e\n",k);
	
	getchar();
	fclose (fp);
	return 0;
}
/* *
 * 运行效果：
 * k is 1.000000e+00
 *
 * */

[赵4老师]

不要把
fopen("...","...");fscanf,fprintf,fclose //读时把\r\n替换成\n，写时把\n替换成\r\n;读到\x1a就设置EOF;读写的内容当字符看待
和
fopen("...","...b");fread,fwrite,fclose //不作以上替换，遇到\x1a仍继续读;读写的内容当字节看待
弄混了