有关于sscanf的问题！

C/C++ code

int _tmain(int argc, _TCHAR* argv[]){char hexstr[HEXSTR_LEN+1] = "1234567890ABCDEF";        unsigned char hex[HEXSTR_LEN/2] = {0x00};        unsigned char tmp = 0;        int i = 0;                printf("sscanf test module init...\n");                printf("hex str: %s\n", hexstr);        printf("hex val: ");        for(i = 0; i < strlen(hexstr)/2; i++)        {                sscanf(hexstr + 2 * i, "%2x", &tmp);                hex[i] = tmp;                printf("%.2x ", hex[i]);                tmp = 0;        }        }

作用是，将1234字符串转成0x12，0x34，这么写，报错，说什么tmp corrupted，一定要这么写才行：

C/C++ code

int _tmain(int argc, _TCHAR* argv[]){char hexstr[HEXSTR_LEN+1] = "1234567890ABCDEF";        unsigned char hex[HEXSTR_LEN/2] = {0x00};        int tmp = 0;        int i = 0;                printf("sscanf test module init...\n");                printf("hex str: %s\n", hexstr);        printf("hex val: ");        for(i = 0; i < strlen(hexstr)/2; i++)        {                sscanf(hexstr + 2 * i, "%2x", &tmp);                hex[i] = （unsigned char）tmp;                printf("%.2x ", hex[i]);                tmp = 0;        }        }

why ？在我看来，0x12一个字节足够保存了，为什么非得int然后强制unsigned char，谢谢

[解决办法]
听说pc-lint能提醒。没实际用过。