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How to copy floating point values from text file to array

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Join Date: Feb 2008

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shaka2

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How to copy floating point values from text file to array

Feb 21st, 2008

 Help with Code Tags 
 c++ Syntax (Toggle Plain Text) 
#include<iostream.h>
#include<stdio.h>
#include<io.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
#include<string.h>
 
void minmax(int);
 
float max[13],min[13],array[13][270];
void main()
{
    FILE *fp;
    char line[100];
	char symptom[10];
	float f;
	fp=fopen("input.txt","r");
	int i=0,j=0,k,l=0;
	int rw_cnt = 0;
	int cl_cnt = 0;
	int len;
 
while(!feof(fp))
 
	{
		//i=0;
		//l=0;
		fgets(line,99,fp);
         printf("%s \n",line);
	//	 getch();
		 rw_cnt++;
	//	 len=strlen(line)+;
	//	line[len]='\0';
		//for(i=0;line[i]!='\n';i++)
		 for (i=0;i<50;i++)
		{
			while(line[i]!=' ')//&& line[i]=='\n')
				{
					symptom[j]=line[i];
					j++;
					i++;
					cl_cnt++;
				}
			symptom[j]='\0';
			printf("Symptom= %s \n",symptom);
			printf("Symptom = %f \n",atof(symptom));
 
		/*for(int l = 0; l<10;l++)
		{
			symptom[l]=0;
		}*/
 
		j = 0;
 
		}
		printf("");
 
}
cout << rw_cnt;
 
		/*
		f=atof(symptom);
			array[l][k]=f;
			l++;
			i++;
			j=0;
			k++;
		printf("array=%d",array[l][k]);
	}
	*/
#include<iostream.h>
#include<stdio.h>
#include<io.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
#include<string.h>

void minmax(int);

float max[13],min[13],array[13][270];
void main()
{
    FILE *fp;
    char line[100];
	char symptom[10];
	float f;
	fp=fopen("input.txt","r");
	int i=0,j=0,k,l=0;
	int rw_cnt = 0;
	int cl_cnt = 0;
	int len;

while(!feof(fp))
	
	{
		//i=0;
		//l=0;
		fgets(line,99,fp);
         printf("%s \n",line);
	//	 getch();
		 rw_cnt++;
	//	 len=strlen(line)+;
	//	line[len]='\0';
		//for(i=0;line[i]!='\n';i++)
		 for (i=0;i<50;i++)
		{
			while(line[i]!=' ')//&& line[i]=='\n')
				{
					symptom[j]=line[i];
					j++;
					i++;
					cl_cnt++;
				}
			symptom[j]='\0';
			printf("Symptom= %s \n",symptom);
			printf("Symptom = %f \n",atof(symptom));

		/*for(int l = 0; l<10;l++)
		{
			symptom[l]=0;
		}*/

		j = 0;
		
		}
		printf("");

}
cout << rw_cnt;

		/*
		f=atof(symptom);
			array[l][k]=f;
			l++;
			i++;
			j=0;
			k++;
		printf("array=%d",array[l][k]);
	}
	*/

I have text file of 270 rows and 13 columns consisting of floating point values.
I want to separate each column separately in the array and find min and max of each array.
Thanks in advance

Last edited by Ancient Dragon; Feb 21st, 2008 at 7:52 am. Reason: corrected code tags

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Re: How to copy floating point values from text file to array

Feb 21st, 2008

Is this a C or C++ program? You have a mixture of the two header files. It looks like mostly C so I'm moving it into the C board.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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Re: How to copy floating point values from text file to array

Feb 21st, 2008

line 1: delete it because stream.h is not a valid header file except in some very old compilers such as Turbo C++. Since you are writing a C program you can't use it here. Also remove most of the other header files because they aren't needed. Looks like all you need is stdio.h and stdlib.h.

line 12: int main() not void main(). main always returns an integer.

line 11. If the file contains 270 rows and 13 columns of data then the arrays you declared are backwards. Also not how to initialize them to 0 values.

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
float array[270][13] = {0.0F};
float max[270] = {0.0F};
float min[270] = {0.0F};
float array[270][13] = {0.0F};
float max[270] = {0.0F};
float min[270] = {0.0F};

After using fgets() to retrieve a line you can use strtok() to split it up into individual parts

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
int column = 0;
char *token = strtok(line," ");
while( token != NULL)
{
    array[row][column] = atof(token);
    token = strtok(line);
}
int column = 0;
char *token = strtok(line," ");
while( token != NULL)
{
    array[row][column] = atof(token);
    token = strtok(line);
}

Last edited by Ancient Dragon; Feb 21st, 2008 at 8:08 am.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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shaka2

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Re: How to copy floating point values from text file to array

Mar 8th, 2008

Thanks for the help. I tried the suggestion but it didnt help.Then I tried code which is given below. I have used iostream because i am going to use c++ also.

 Help with Code Tags 
 c Syntax (Toggle Plain Text) 
#include "stdafx.h"
#include<stdio.h>
#include<math.h>
 
float example[14][270];
int  main()
{
	//printf("Hello World!\n");
 
FILE *fp;
const int nLineSize = 4096;
char line[nLineSize + 2];
char symptom[10];
int i=0,j=0,k=0,m=0;
int row_cnt=0;
float val;
fp=fopen("inputk.txt","r");
 
if (fp == NULL)
{
	perror ("Error opening file");
	exit(1);
}
 for(k=0;k<270;k++)// loop for no. of the rows
	   {
            i=0;
			m=0;
			line[0] = 0;
            fgets(line,nLineSize,fp);
            row_cnt++;
            puts (line);
         while(line[i]!='\n'&&m<13)
		 {
           while(line[i]!=' ')
			  {
		        symptom[j]=line[i];
                j++;
		        i++;
			  }
	       val=atof(symptom);
		   example[m][k]=val;
			m++;
			i++;
            j=0;
     		 }
   }
 
 
     symptom[0]=line[i];
		val=atof(symptom);
		//cout<<val;
		example[m][k]=val;
cout<<"total rows:="<<row_cnt<<endl;
 
for( i=0;i<270;i++)
	{
		for(j=0;j<13;j++)
			cout<<example[j][i]<<"  ";//display the array
 
	  cout<<"\n";
	 }
 
}
#include "stdafx.h"
#include<stdio.h>
#include<math.h>

float example[14][270];
int  main()
{
	//printf("Hello World!\n");

FILE *fp;
const int nLineSize = 4096;
char line[nLineSize + 2];
char symptom[10];
int i=0,j=0,k=0,m=0;
int row_cnt=0;
float val;
fp=fopen("inputk.txt","r");

if (fp == NULL)
{
	perror ("Error opening file");
	exit(1);
}
 for(k=0;k<270;k++)// loop for no. of the rows
	   {
            i=0;
			m=0;
			line[0] = 0;
            fgets(line,nLineSize,fp);
            row_cnt++;
            puts (line);
         while(line[i]!='\n'&&m<13)
		 {
           while(line[i]!=' ')
			  {
		        symptom[j]=line[i];
                j++;
		        i++;
			  }
	       val=atof(symptom);
		   example[m][k]=val;
			m++;
			i++;
            j=0;
     		 }
   }
  
     
     symptom[0]=line[i];
		val=atof(symptom);
		//cout<<val;
		example[m][k]=val;
cout<<"total rows:="<<row_cnt<<endl;

for( i=0;i<270;i++)
	{
		for(j=0;j<13;j++)
			cout<<example[j][i]<<"  ";//display the array
				
	  cout<<"\n";
	 }

}

But now my problem is, code works only for the fixed number of rows and columns.
But I want to make it work for any no of row and column .
please help me

Last edited by Ancient Dragon; Mar 8th, 2008 at 9:49 am. Reason: Corrected code tags -- use [code], not <code>

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Re: How to copy floating point values from text file to array

Mar 8th, 2008

use const int values to define the array dimensions then use those variables in the code. Or you could do something like this:

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
int rows = sizeof( example ) / sizeof( example[0] );
int cols = sizeof( example[0] ) / sizeof(float);
for(k=0;k< rows ;k++) // line 24
{
 
}
int rows = sizeof( example ) / sizeof( example[0] );
int cols = sizeof( example[0] ) / sizeof(float);
for(k=0;k< rows ;k++) // line 24
{

}