what is %0qx

manomohan · 03-22-2006, 12:22 PM

key_t temp;

temp = ftok("ftok_test.c", 'a');
printf("id 2 temp = %0qx\n",temp);

Here in the above code what is " %0qx "

graemef · 03-22-2006, 12:34 PM

Its the format string, explaining how the variable temp will be displayed.

% signifies the start of a format string
0 means pad with a zero
q probably a typo - it doesn't have any special meaning that I can think of. had it been a 2 then this would say the number of characters to be printed out
x this is the conversion and says display the value as a hexadecimal number

Hko · 03-22-2006, 04:54 PM

'q' is an alias for 'll', which means "long long integer".
You can read all about this in "man 3 printf".