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\\rajesh\\temp\\");
strcpy(temp,path);
if((in=fopen(strcat(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\\rajesh\\temp\\");
strcpy(temp,path); 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_filename[MAX_FILE_NAME];

assert(MAX_FILE_NAME > (sizeof(Directory_Name)
+ sizeof(File_Name));

strcpy(complete_filename, Directory_Name);
// strcat(complete_filename, File_Name);
strcpy(complete_filename + sizeof(Directory_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(strcat(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

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--
Thomas Matthews

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