whether "abc"[0] in standard C

From: ccwork (ccwork_at_hotmail.com)
Date: 02/28/05 

Date: 28 Feb 2005 01:18:15 -0800

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?

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