read float value from file

[Mahesh]

Dear friends,
In the following code, I can't read the float value from
file(temp.txt). Run-time error is coming. I am using Visual C++.

#include<stdio. h>
#include<math.h >
#include<string .h>
#include<stdlib .h>
int main()
{

float a;
char temp[50],path[50];
FILE *in;

strcpy(path,"D: \\user\\smp\\ra jesh\\temp\\");
strcpy(temp,pat h);
if((in=fopen(st rcat(temp,"temp .txt"),"r")) == NULL)
{
printf("Error : Opening file in.txt!!!!!\n\n \n");
return 0;
}

fscanf(in,"%f", &a);
return 0;
}

Please guide me.

-Mahesh

[Thomas Matthews]

Mahesh wrote:

Dear friends,
In the following code, I can't read the float value from
file(temp.txt). Run-time error is coming. I am using Visual C++.

#include<stdio. h>
#include<math.h >
#include<string .h>
#include<stdlib .h>
int main()
{

float a;
char temp[50],path[50];
FILE *in;

strcpy(path,"D: \\user\\smp\\ra jesh\\temp\\");
strcpy(temp,pat h); I really can't figure out why you need the above line.
Try this:
const unsigned int MAX_FILE_NAME = 50;
const char * const Directory_Name =
"D:\\user\\smp\ \rajesh\\temp\\ ";
const char * const File_Name = "temp.txt";
char complete_filena me[MAX_FILE_NAME];

assert(MAX_FILE _NAME > (sizeof(Directo ry_Name)
+ sizeof(File_Nam e));

strcpy(complete _filename, Directory_Name) ;
// strcat(complete _filename, File_Name);
strcpy(complete _filename + sizeof(Director y_Name) - 1,
File_Name); // this one is a little faster than
// strcat.
in = fopen(complete_ filename, "r");
if (!in)
{
printf("Error opening: \"%s\"\n", complete_line);
return EXIT_FAILURE;
}

if((in=fopen(st rcat(temp,"temp .txt"),"r")) == NULL)
{
printf("Error : Opening file in.txt!!!!!\n\n \n");
return 0;
}

fscanf(in,"%f", &a);
return 0;
}

Please guide me.

-Mahesh

For more details, post your data file.
--
Thomas Matthews

C++ newsgroup welcome message:
http://www.slack.net/~shiva/welcome.txt
C++ Faq: http://www.parashift.com/c++-faq-lite
C Faq: http://www.eskimo.com/~scs/c-faq/top.html
alt.comp.lang.l earn.c-c++ faq:
http://www.raos.demon.uk/acllc-c++/faq.html
Other sites:
http://www.josuttis.com -- C++ STL Library book