[問題] 關於身分證字號判斷
以下是小弟在網路上看到的函式，想請問各位高手
為什麼return checksum %10 == 0; 可以表示 return 1;
麻煩各位高手解惑，萬分感激!
int checkSID(char * str)
{
char string[]="ABCDEFGHJKLMNPQRSTUVWXYZIO"; //10~35
int i, checksum;
if ( strlen(str) == 10 && (str[1] == '1' ||str[1] == '2') )
{
i = strchr(string, str[0] & 0xDF) - string + 10;
checksum = i / 10 + i % 10 * 9;
for(i = 1; i < 9; ++i)
checksum += (str[i] - '0') * (9 - i);
checksum += (str[9] - '0');
return checksum % 10 == 0;
}
return 0;
}
--
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◆ From: 122.118.212.80
※ 編輯: acerder 來自: 122.118.212.80 (12/30 01:09)
※ 編輯: acerder 來自: 122.118.212.80 (12/30 01:12)
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12/30 01:15, , 1F
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12/30 01:16, , 2F
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