#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#define initial_value 0.07
#define increment 0.125
int read_one_float( float* out_float, FILE *f ) ;
int main(int argc, char *argv[])
{
    while (1)
    {
        FILE *file_pointer = 0;
        char ch = 0;
        char filename[40] = "" ;
        long lSize = 0;
        float *buffer = 0;
        float tmp_float = 0 ;
        int i = 0, j = 0 ;
        // Input filename.
        printf("\n%c %c %c %c Enter a filename %c %c %c %c : ", 4, 5, 3, 6, 6, 3, 5, 4);
        gets(filename);
 
        // Try to open the file.
        if ( (file_pointer = fopen(filename, "rb")) == NULL )
        {
                perror("\nError opening file");
                puts("\nEnter x to exit, any other to try again.");
                if ( (ch = getch()) == 'x')
                break;
        }
        else
        {
        printf("\nSuccessful opened %s!\n", filename);
        //if we reach here file is opened successfully..
        //given it's an ascii file lets assume that there is
        //one float number per line. So total number of floats
        //in file is same as number of new lines + 1.
        // calculate the size of our buffer.
            while( EOF != (ch = fgetc(file_pointer)) )
            if( ch == '\n' )
                        lSize++ ;
            lSize++ ;
            rewind (file_pointer);
 
        // allocate memory to contain the whole file.
            buffer = (float*)malloc(sizeof(float)*lSize);
            if (buffer == NULL) return 1;
            else printf("\n%d bytes of memory allocated to buffer...", sizeof(float)*lSize);
 
        // copy the file into the buffer.
            while( 0 != read_one_float( &tmp_float, file_pointer ) )
            buffer[i++] = tmp_float ;
            printf("\nNumber of entries read : %d\n\n", i-- ) ;
        // terminate
            fclose (file_pointer);
            free (buffer);
        // prints values assigned into the array.
            printf("\nData read from file is :\n") ;
            for( j = i; j >= 0; j-- )
            printf("\nbuffer[%d] = %f", i-j, buffer[i-j] ) ;
            printf("\n\n") ;
        // waits for user input to continue
            system("pause");
            system ("cls");
            puts("\nEnter x to exit, any other begin again!.");
            if ( (ch = getch()) == 'x')
            break;
        }
    }
}
//--------------FUNCTIONS--------------
 
int read_one_float( float* out_float, FILE *f )
{
        char buf[100] = "" ;
    if (0 == fgets(buf, 100, f))
        return 0 ;
        *out_float = atof( buf ) ;
    return 1;
}

i++

i--

buffer[1]