Thread: Retrieving Multiple inputs with fgets?

> fgets(*userInput, 160, stdin);
You have a splendid nack of trying every single possible combination except the right ones told to you by everyone else.

Are you a troll?

You have a splendid nack of trying every single possible combination except the right ones told to you by everyone else.

My original question is yet to be answered. I still can't fill a 2-d array with fgets :| well, i can sort of but i want to manipluate the columns as it's filling. I tried using a pointer that worked, but the array wasn't being filled properly, tried the actual index number of the element i.e. array[0][0] that didn't work. What confuses me is that array[line] works but array array[line][line2] does not.

Really, i don't mean to be of any annoyance and mostly all the stuff i use comes from books or online.

Code:

userInput[0][0] = 'H';
userInput[0][1] = 'e';
userInput[0][2] = 'l';
userInput[0][3] = 'l';
userInput[0][4] = 'o';
userInput[0][5] = ' '; // The ony problem i see is the newline that will get included using fgets

to solve above problem, do this

Code:

char *n;
n = strchr( userInput[0], '\n' );
*n = '\0';

and also why woud you print the characters one by one when you can print is as a whole

Code:

  printf("%c", userInput[line1][line2]); // WTF!!  :eek:

   

just do:
printf( "%s", userInput[line1] );

	
Code:
	
    for (row = 0 ; line < 6; row++)
        fgets(userInput[row][col], 160, stdin);   // this is wrong
should be fgets(userInput[row], sizeof( userInput[row] ), stdin);

I suggest that you go and read the replies to this thread before posting some more questions. Your too excited

Compile, run and study this and see if it helps you:

Code:

#include <stdio.h>
#include <ctype.h>

int main(void)
{
  char userInput[2][20];
  int i, j;
  
  for (i = 0; i < 2; i++)
  {
    sprintf (userInput[i], "This is line %d", i);
  }
  
  printf ("Printing complete array:\n");
  
  for (i = 0; i < 2; i++)
  {
    for (j = 0; j < 20; j++)
    {
      printf ("userInput[%d][%2d] = '%c'\n",  
              i, j, isprint(userInput[i][j]) ? userInput[i][j] : '.' );
    }
  }
  
  printf ("Printing only populated area of array:\n");
  
  for (i = 0; i < 2; i++)
  {
    for (j = 0; j < 20 && userInput[i][j] != '\0'; j++)
    {
      printf ("userInput[%d][%2d] = '%c'\n",  
              i, j, isprint(userInput[i][j]) ? userInput[i][j] : '.' );
    }
  }
  
  printf ("Printing as strings:\n");
  
  for (i = 0; i < 2; i++)
  {
    puts (userInput[i]);
  }
  
  return(0);
}


/*
 Output
 
Printing complete array:
userInput[0][ 0] = 'T'
userInput[0][ 1] = 'h'
userInput[0][ 2] = 'i'
userInput[0][ 3] = 's'
userInput[0][ 4] = ' '
userInput[0][ 5] = 'i'
userInput[0][ 6] = 's'
userInput[0][ 7] = ' '
userInput[0][ 8] = 'l'
userInput[0][ 9] = 'i'
userInput[0][10] = 'n'
userInput[0][11] = 'e'
userInput[0][12] = ' '
userInput[0][13] = '0'
userInput[0][14] = '.'
userInput[0][15] = '.'
userInput[0][16] = '.'
userInput[0][17] = '.'
userInput[0][18] = '@'
userInput[0][19] = '.'
userInput[1][ 0] = 'T'
userInput[1][ 1] = 'h'
userInput[1][ 2] = 'i'
userInput[1][ 3] = 's'
userInput[1][ 4] = ' '
userInput[1][ 5] = 'i'
userInput[1][ 6] = 's'
userInput[1][ 7] = ' '
userInput[1][ 8] = 'l'
userInput[1][ 9] = 'i'
userInput[1][10] = 'n'
userInput[1][11] = 'e'
userInput[1][12] = ' '
userInput[1][13] = '1'
userInput[1][14] = '.'
userInput[1][15] = '.'
userInput[1][16] = 'H'
userInput[1][17] = '.'
userInput[1][18] = '@'
userInput[1][19] = '.'
Printing only populated area of array:
userInput[0][ 0] = 'T'
userInput[0][ 1] = 'h'
userInput[0][ 2] = 'i'
userInput[0][ 3] = 's'
userInput[0][ 4] = ' '
userInput[0][ 5] = 'i'
userInput[0][ 6] = 's'
userInput[0][ 7] = ' '
userInput[0][ 8] = 'l'
userInput[0][ 9] = 'i'
userInput[0][10] = 'n'
userInput[0][11] = 'e'
userInput[0][12] = ' '
userInput[0][13] = '0'
userInput[1][ 0] = 'T'
userInput[1][ 1] = 'h'
userInput[1][ 2] = 'i'
userInput[1][ 3] = 's'
userInput[1][ 4] = ' '
userInput[1][ 5] = 'i'
userInput[1][ 6] = 's'
userInput[1][ 7] = ' '
userInput[1][ 8] = 'l'
userInput[1][ 9] = 'i'
userInput[1][10] = 'n'
userInput[1][11] = 'e'
userInput[1][12] = ' '
userInput[1][13] = '1'
Printing as strings:
This is line 0
This is line 1
*/

Some notes:

- When printing the entire array, the areas after the actual data are filled with unpredicatable data. That's the nature of uninitialised memory.

- In my second print loop, I said "print populated area". I have neglected to print the \0 terminator for each string, which is technically part of the "populated area". Minor technicallity, didn't want to get picked up on it!

- I used isprint() to determine if a character is printable before attempting to print it. That way, any unprintable characters will be displayed as a dot instead of garbage.

- My data is simulated input, what out for the \n that fgets() may add to the end of the userInput string.

ok, copying the userInput array into a 'clean' array with no spaces didn't work. The same thing happens when printing out the array even if you include a for loop saying i don't want '\0'

Code:

    for (line = 0 ; line < 6; line++)
       fgets(userInput[line], 160, stdin);


int i, j;

 for (i = 0; i < 6; i++)
  {
    for (j = 0; j < 160 && userInput[i][j] != '\0'; j++)
    {
      printf("\n%s", "Column "); printf("%d ", j); printf("%s", "has -=> ");
      printf ("%c", userInput[i][j]);
    }
  }

result:


Column 0 has -=> h
Column 1 has -=> e
Column 2 has -=> l
Column 3 has -=> l
Column 4 has -=> o
Column 5 has -=>

Column 0 has -=> h
Column 1 has -=> e
Column 2 has -=> l
Column 3 has -=> l
Column 4 has -=> o
Column 5 has -=>

Column 0 has -=> h
Column 1 has -=> e
Column 2 has -=> l
Column 3 has -=> l
Column 4 has -=> o
Column 5 has -=>

Column 0 has -=> h
Column 1 has -=> e
Column 2 has -=> l
Column 3 has -=> l
Column 4 has -=> o
Column 5 has -=>

Column 0 has -=> h
Column 1 has -=> e
Column 2 has -=> l
Column 3 has -=> l
Column 4 has -=> o
Column 5 has -=>

Column 0 has -=> h
Column 1 has -=> e
Column 2 has -=> l
Column 3 has -=> l
Column 4 has -=> o
Column 5 has -=>




... bit strange don't you think? EVEN after i specifically said in the inner for loop to not include spaces.

It's not a space. It's a newline. You're using fgets, which includes the newline in the input. Try printing the decimal value of the character instead of the character representation of it. (%d)


Quzah.

>>i put != '\n' in the for loop and it works now thanks
Just remember, fgets() won't always put a \n at the end of the string.