In C + + program, see the following section of the program , please help analyze this usage .

typedef unsigned int U32;
.....

U32 w;
U32 h;
U32 s;

sprintf (str, "% uX% uX% c", w, h, s);
% c
how can it ? Front two should be the same, with % u right
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% c to print a character chant , controlled ascii table
example s is equal to 65 , print it out is A
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that bug chant
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should not a bug, that is so written , and the program is released , and no problem running
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If s in the range 0 to 255 should be no problem
mean look at this
Perhaps s values ​​may be visible characters such as 0-9A-Za-z so