- 27 名前：デフォルトの名無しさん mailto:sage [2009/01/03(土) 16:31:08 ]
- 短くと言うのは、ソースの行数なのか実行文のサイズなのか？
ソースなら
unsigned char ascii2hex(unsigned char h) {
return h - (h <= '9' ? '0' : (h <= 'F' ? 'A' - 10 : 'a' - 10));
}
実行文なら
unsigned char ascii2hex(unsigned char h) {
static const unsigned char *const t = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0,
0,10,11,12,13,14,15,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,10,11,12,13,14,15
};
return t[h];
}
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