求助！，C语言编程，文件无法打开。

[zdc21092]

void Initialization() //初始化
{
int i,j,k=0;
FILE* HFM_f;


printf("已有文件?");
{
scanf("%d",&k);
printf("------------------\n");
}
if(k==0)
{
HFM_f = fopen("hfmtree.txt","aw"); //打开HuofumanTree.txt文件
if(HFM_f == NULL)
{
printf("create file error!\n");
}
printf(" 请输入字符集大小: ");
scanf("%d",&leaves);
fprintf(HFM_f,"----输入的值-----\n"); //输入到文件中
fprintf(HFM_f," 字符大小%4d\n",leaves);
fprintf(HFM_f," 字符 权值\n");
for(i=0;i<leaves;i++)
{
printf(" 请输入第%d个字符和其权值:",i+1); //输入字符与权值
scanf(" %c ",&HFM_num[i].hfstr);
scanf("%d",&HFM_num[i].weight);
fprintf(HFM_f,"%4c",HFM_num[i].hfstr);
fprintf(HFM_f,"%4d\n",HFM_num[i].weight);//存储字符和权值
}
}
else
{
[ //HFM_f=fopen("hfmtree.txt","w");
HFM_f=fopen("hfmtree.txt","r");

if(HFM_f==NULL)
{
printf("ERROR");
exit(0);
}

fscanf(HFM_f,"%d",&leaves);
printf("%d",leaves);
for(i=0;i<leaves;i++)
{
printf(" 请输入第%d个字符和其权值:",i+1); //输入字符与权值
fscanf(HFM_f,"%c",&HFM_num[i].hfstr);
fscanf(HFM_f,"%d",&HFM_num[i].weight);
//fprintf(HFM_f,"%4c",HFM_num[i].hfstr);
//fprintf(HFM_f,"%4d\n",HFM_num[i].weight);
//存储字符和权值
}
//fclose(HFM_f);
}

[qq_36541620]

你要实现什么功能呀？？

[zdc21092]

建立一个霍夫曼树，将输入的字符和对应的权值保存在“hfmtree.txt”中，在第二次打开的时候就直接调用，但是在运行的时候,以读的方式一直打不开“hfmtree.txt”。但是就在刚才又不知道为什么行了。。。

[赵4老师]

// GETCWD.C
/* This program places the name of the current directory in the 
 * buffer array, then displays the name of the current directory 
 * on the screen. Specifying a length of _MAX_PATH leaves room 
 * for the longest legal path name.
 */

#include <direct.h>
#include <stdlib.h>
#include <stdio.h>

void main( void )
{
   char buffer[_MAX_PATH];

   /* Get the current working directory: */
   if( _getcwd( buffer, _MAX_PATH ) == NULL )
      perror( "_getcwd error" );
   else
      printf( "%s\n", buffer );
}

/* CHGDIR.C: This program uses the _chdir function to verify
 * that a given directory exists.
 */

#include <direct.h>
#include <stdio.h>
#include <stdlib.h>

void main( int argc, char *argv[] )
{
   if( _chdir( argv[1] )   )
      printf( "Unable to locate the directory: %s\n", argv[1] );
   else
      system( "dir *.wri");
}