terminating null char for 2D array

Question

I have this nested loops working but I am printing extra char at the end because I don't know how to terminate the null char in 2D array. Here is the code:

char arr[100];
char twoDArray[100][100];
int y = 0, x = 0,  h= 10, w = 10,j=0;
for(y = 0; y <= h; y++)
{
  for(x = 0; x <= w; x++)
  {
    twoDArray[y][x] = arr[j];
    printf("%c", twoDArray[y][x]);
    j++;
  }
}

Where is your data being initialized? This example shows only empty arrays being used. Also, did you mean to use <= in your for-loops? Usually that results in "extra" data being used because arrays in C are 0-based, and the max you'd be able to use is 0 to length-1. — Ryan J
– Ryan J, Commented Sep 18, 2014 at 16:36

Community · Accepted Answer · 2017-05-23 12:16:23Z

2

For null character in c following character is used.

'\0'

Check out following link.

http://www.tutorialspoint.com/cprogramming/c_strings.htm

String termination - char c=0 vs char c='\0'

Just compare in loop.

if(twoDArray[y][x]=='\0')
{
     break;
}

edited May 23, 2017 at 12:16

CommunityBot

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answered Sep 18, 2014 at 16:34

Nirav Kamani

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1 Comment

Kenneth Over a year ago

I know @RyanJ I just had to wait 1 min for some reason. Thanks for the help anyway..!!

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