whether "abc"[0] in standard C

[ccwork]

Hi all,
I found some people writing code as:
/****************** sample code ********************/
int ans;
...
printf("%c\n", " yn"[ans]);
/***************** sample code end *****************/

The value of variable "ans" will be an index to print ' ', 'y' or
'n'. Is this a syntax " yn"[ans] in standard C?

 

[Chris Dollin]

Hi all,
I found some people writing code as:
/****************** sample code ********************/
int ans;
...
printf("%c\n", " yn"[ans]);
/***************** sample code end *****************/

The value of variable "ans" will be an index to print ' ', 'y' or
'n'. Is this a syntax " yn"[ans] in standard C?

Yes. It's just array indexing.

 

[Serve Lau]

Hi all,
I found some people writing code as:
/****************** sample code ********************/
int ans;
...
printf("%c\n", " yn"[ans]);
/***************** sample code end *****************/

The value of variable "ans" will be an index to print ' ', 'y' or
'n'. Is this a syntax " yn"[ans] in standard C?

yes

 

[Krishanu Debnath]

Hi all,
I found some people writing code as:
/****************** sample code ********************/
int ans;
...
printf("%c\n", " yn"[ans]);
/***************** sample code end *****************/

The value of variable "ans" will be an index to print ' ', 'y' or
'n'. Is this a syntax " yn"[ans] in standard C?

yes, even ans["yes"] is valid too.

Krishanu

 

[Clark S. Cox III]

Hi all,
I found some people writing code as:
/****************** sample code ********************/
int ans;
...
printf("%c\n", " yn"[ans]);
/***************** sample code end *****************/

The value of variable "ans" will be an index to print ' ', 'y' or
'n'. Is this a syntax " yn"[ans] in standard C?

Yes. This might make more sense to you, if you consider that (" yn") is
nothing more than an array of characters. Your sample code is similar
to:

int ans;
const char array[] = " yn";
...
printf("%c\n", array[ans]);

 

[ccwork]

Hi all,
Thanks for all

Hi all,
I found some people writing code as:
/****************** sample code ********************/
int ans;
...
printf("%c\n", " yn"[ans]);
/***************** sample code end *****************/

The value of variable "ans" will be an index to print ' ', 'y' or
'n'. Is this a syntax " yn"[ans] in standard C?

Yes. This might make more sense to you, if you consider that (" yn") is
nothing more than an array of characters. Your sample code is similar

to:

int ans;
const char array[] = " yn";
...
printf("%c\n", array[ans]);