Character out of range

[Brian90]

Hi guys,

I am having headache over this problem. I needed to randomise the position of different pairs of characters. The 2D array I chose to use is 6 x 6 which is 36 in total. This means that i only needed to use 18 pairs of characters. I chose to use character 'a' to 'r', between interger value of 97 and 114, which the range of them is 18. But when I print the result characters such as 'z' or 'y' which should'nt be in the range came out as well. By the way, when I print the result nomatter what type of variable I set it as it still came out as characters. I doesn't understand quite much about these ASCII codes.

Any help or explaination is appreciated.
Thanks

[msh]

Is arr[] static or initialized to zero somewhere before this snippet? Otherwise it contains garbage that you shouldn't be comparing against.

Furthermore, this code will only set values for 18 out of 36 elements in arr[].

[Brian90]

Sorry I forgot to mention that. Yes I did initialised the whole array to 0 before comparing it. I had put a for loop before the randomisation of position which should be running it the second time.

[msh]

My mistake, I missed the top for loop.

Could you show us how you print out the values? I put your code in a complete program, and the output appears correct to me.

f  o  b  n  q  p
j  k  k  r  g  i
r  l  h  l  j  a
h  c  f  a  q  m
m  n  p  b  d  c
i  g  d  e  e  o

[Brian90]

Its ok. Here is how I print it :

for(i=0; i<6; i++)
    {
       for(j=0; j<6; j++)
            printf("%c ", arr[i][j]);
            printf("\n");
     }

Btw, even if I put %i, it still shows the result as characters.

[Bayint Naung]

Btw, even if I put %i, it still shows the result as characters.

Maybe you forgot to compile after making changes.?

[Brian90]

I did compliled it before running it..