about niosII

[Altera_Forum]

Hi, 

I write in NiosII this instruction  int a,b; int r; a=4; b=98; r=a&&b; the problem i have a message error ,when i use && ,I don't know why ? can sameone help me to use this commande && ? thank you

[Altera_Forum]

The sintax is correct. 

What's the compiler error message? PS: I'd recommend spaces to separate && symbol (logical AND); although this is not mandatory, it will improve code readability.

[Altera_Forum]

i try with espace but i have the some error 

this a part of code of erode   int **IM ,**im1;  unsigned char r,u,ml,mm,mr,d; for(int i=1;i<height-1;i++){  for(int j=1;j<width-1;j++)  {  u = im1[i-1][j];  ml = im1[j-1];   mm = im1[j];   mr = im1[j+1];  d = im1[i+1][j];  r= (u && d) && (ml && mr && mm); im[j]=r }} this code turn witn succes under visual c++ but under nios II a i have this error: expected unqualified-id before  processeur failed

[Altera_Forum]

--- Quote Start ---   for(int i=1;i<height-1;i++){  for(int j=1;j<width-1;j++)   --- Quote End ---   You can't define variables inside the for loop instruction.  This mode is not supported by Nios C compiler. Declare i and j with other variables.    --- Quote Start ---   int **IM ,**im1;   --- Quote End ---   IMHO this declaration is ambiguous if you then use these pointers to address a bidimensional array. You don't specify dimensions, so, how can compiler know how to map array indexes to memory?    --- Quote Start ---   IM[i][j]=r   --- Quote End ---   Semicolon missing  Regards Cris

[Altera_Forum]

defining variables in for loops is legal in C++, but not in C. Visual isn't a 100% compliant C compiler and sometimes lets you do non standard things ;) 

 The biggest problem with this code is that you use the IM and im1 pointers without assigning them a proper value first. This will probably crash in most cases. You should define static arrays instead.