Getting float data from text file to array

alishaikhji · #1 01-Jun-2009, 21:53

Hello

I am a newbie to C language. I need to use the data (48 values) from a text file (which area float values) in the following form:
80.00 23.00 82.00 22.00 80.00 23.00 81.00 24.00 80.00 22.00 80.00 23.00 84.00 24.00 80.00 22.00 82.00 32.00 120.00 102.00 120.00 132.00 120.00 140.00 120.00 150.00 110.00 141.00 120.00 128.00 110.00 118.00 105.00 100.00 105.00 87.00 80.00 38.00 82.00 30.00 80.00 23.00 78.00 22.00 80.00 22.00 79.00 22.00

I need this data to form an array which i could use for further work. I have worked out the following program but it gives 0.000000 (48 times) only.

I am using CodeBlocks open source IDE/compiler on windows XP.

My present program is as follows:

CPP / C++ / C Code:

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

int main(void)
{

 FILE *fp;   /* file pointer */
 float mgone[48];
 int i;

if((fp=fopen("mg1.txt", "r"))==NULL) {
    printf("Cannot open file.\n");
  }

  if(fread(mgone, sizeof(float), 48, fp) != 48) {
    if(feof(fp))
       printf("Premature end of file.");
    else
       printf("File read error.");
  }
  fclose(fp);

  for(i=0; i<48; i++)
    printf("%f ", mgone[i]);

  return 0;
}

Thanks & Regards

Ali

davekw7x · #2 01-Jun-2009, 23:04

Quote:

Originally Posted by alishaikhji

...data (48 values) from a text file...to form an array...

The fread() function reads binary values, (bytes that make up floating point numbers in machine representation).

To read the values that are expressed as characters in a text file, you can make a loop that reads the values with fscanf().

Maybe do something like:

CPP / C++ / C Code:

.
.
.
    int i, n;
    FILE *fp;
    float mgone[48];
.
.    /* open the file */
.
    for (i = 0; i < 48; i++) {
        if (fscanf(fp, "%f", &mgone[i]) != 1) {
            break;
        }
    }
    fclose(fp);
    n = i;
    printf("Number read = %d\n", n);

    for (i = 0; i < n; i++) {
        printf("mgone[%d] = %f\n", i, mgone[i]);
    }

Regards,

Dave

alishaikhji · #3 02-Jun-2009, 20:03

thanks Dave.. it solved the problem

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Getting float data from text file to array

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Re: Getting float data from text file to array