Re:

[Patrick Townsend <townsend@xxxxxxxxxxxxxx>]

Mike,

char   mychar;        /* this defines a single character, not a string */
char   mystring[6];   /* this defines a string of 6 bytes. it contains 
garbage */
                       /* until you initialize it */

How to compare a character (note the use of single quote):

       if (mychar == '1')
         foo();

How to compare a string (note the use of double quote):

       if (!strcmp(mystring, "hello"))
         foo();

There are other string comparisons. strncmp() compares strings for a given 
number of bytes. stricmp() ignores case on the compare, etc.

If you want to check the value of a single character in a string you can do:

       if (mystring[4] == '1')
          foo();

This checks the fifth position in the string for the character value of '1'.

Strings are not null terminated until you make them so. Some C functions 
will automatically terminate a string with a null. Some examples:

     memset(mystring, 0, sizeof(mystring));    /* sets the entire string to 
nulls */
     strcpy(mystring, "hello");                /* creates a null terminated 
string */


Patrick

At 09:03 PM 6/20/2000 -0400, Pantzopoulos, Mike wrote:

>I'm a bit confused about how to deal with a single character. Is a char 
>x[1]; or char x; statement defining a string or a character?
>
>Ishould it be compared via a ............if(x== '1')  statement or should 
>a strcmp function be invoked? I presume that any definition such as char 
>x[6] defines a string (as null terminated). So is char x[1] defining a 
>null terminated string of length 2 (inclusive of the null character)?
>

---
IBM AS/400 communications, FTP automation, and network security
software and consulting services.

http://www.patownsend.com

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