UVa problem 11231: sample code

001 #include "stdio.h"
002 
003 int main() {
004   char   line[100]
005        , first_box
006        , black
007        , white
008        ;
009 
010   int   n
011       , m
012       , c
013       , ne
014       , me
015       , code
016       , x
017       , y
018       , z
019       , q
020       , r
021       , s
022       , v
023       ;
024 
025   black = 'b';
026   white = 'w';
027 
028   while (fgets(line, 100, stdin)) {
029     sscanf(line, "%d %d %d", &n, &m, &c);
030 
031     if (n == 0 && m == 0 && c== 0) {
032       break;
033     }
034 
035     ne = n & 1;
036     me = m & 1;
037 
038     ne <<= 2;
039     me <<= 1;
040 
041     code = 0;
042     code = ne | me | c;
043 
044     if (code == 0) {
045       first_box = black;
046     }
047     else if (code == 1) {
048       first_box = white;
049     }
050     else if (code == 2) {
051       first_box = white;
052     }
053     else if (code == 3) {
054       first_box = black;
055     }
056     else if (code == 4) {
057       first_box = white;
058     }
059     else if (code == 5) {
060       first_box = black;
061     }
062     else if (code == 6) {
063       first_box = black;
064     }
065     else {
066       first_box = white;
067     }
068 
069     if (first_box == white) {
070       x = n - 6;
071       x >>= 1;
072 
073       y = m - 6;
074       y >>= 1;
075 
076       q = n - 7;
077       q >>= 1;
078 
079       r = m - 7;
080       r >>= 1;
081     }
082     else {
083       x = n - 7;
084       x >>= 1;
085 
086       y = m - 6;
087       y >>= 1;
088 
089       q = n - 6;
090       q >>= 1;
091 
092       r = m - 7;
093       r >>= 1;
094     }
095 
096     z = x * y;
097     s = q * r;
098 
099     v = z + s;
100 
101     printf("%d\n", v);
102   }
103 
104   return 0;
105 }