Array access

**Kempelen** · 05-06-2009

I dont know if the following is a bug or something I am doing wrong. I have compiled this with Codeblock and MINGW.

The following code:

Code:

#include <stdio.h>

const int EV[17] = {-30,-27-24,-21,-18,-15,-12,-9,-6,-3,0,3,6,9,12,15,18};
const int ET[3] = {1,2,3};

int main(void)

{
  int x = 16;
  printf("EV[%d] = %d\n",x,EV[x]);
  x = 2;
  printf("ET[%d] = %d\n",x,ET[x]);
}

is showing this output:

Code:

EV[16] = 0
ET[2] = 3

Why EV[16] is showing 0 and not 18 ??

p.s.: I have also compile this with tcc with the same output.

**matsp** · 05-06-2009

Code:

... -30,-27-24, ...

Would there be a comma missing on that line?

--
Mats

**laserlight** · 05-06-2009

Because the second element of EV is -27-24=-51, the third is -21, ..., the second last is 18 and the last is 0.

**Kempelen** · 05-06-2009

Originally Posted by matsp

Code:

... -30,-27-24, ...

Would there be a comma missing on that line?

--
Mats

Oh my god. I have reviewed the code a few times and didn't noted anything. I don't know why I use glasses......

thx

**BEN10** · 05-06-2009

Originally Posted by Kempelen

I dont know if the following is a bug or something I am doing wrong. I have compiled this with Codeblock and MINGW.

The following code:

Code:

#include <stdio.h>

const int EV[17] = {-30,-27-24,-21,-18,-15,-12,-9,-6,-3,0,3,6,9,12,15,18};
const int ET[3] = {1,2,3};

int main(void)

{
  int x = 16;
  printf("EV[%d] = %d\n",x,EV[x]);
  x = 2;
  printf("ET[%d] = %d\n",x,ET[x]);
}

.

main should return 0 at last.

**laserlight** · 05-06-2009

Originally Posted by BEN10

main should return 0 at last.

That is optional with respect to the 1999 edition of the C standard.

**BEN10** · 05-06-2009

Originally Posted by laserlight

That is optional with respect to the 1999 edition of the C standard.

Thanks for the information, but how can it be optional because any function which returns int should actually do that, otherwise it's return type will be void. Seriously these types of things in C confuses me a lot.

**laserlight** · 05-06-2009

Originally Posted by BEN10

Thanks for the information, but how can it be optional because any function which returns int should actually do that, otherwise it's return type will be void.

Special case for the main function.

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