unsigned int
	hexval(char *str);

main(int argc, char *argv[])
{
        if(argc != 2){
                printf("コマンドの入力形式が間違っています.\n");        
                return;
        }
	printf("%x\n", hexval(argv[1]));
}


unsigned int
	hexval(char *str)
{
	unsigned long
		num;
	int	i1, ch;

	num = 0L;
	for(i1 = 0; ; i1++){
		if(str[i1] >= '0' && str[i1] <= '9'){
			ch = str[i1] - '0';
		}
		else if(str[i1] >= 'a' && str[i1] <= 'f'){
			ch = str[i1] - 'a' + 10;
		}
		else if(str[i1] >= 'A' && str[i1] <= 'F'){
			ch = str[i1] - 'A' + 10;
		}
		else if(str[i1] == '\0'){
			break;
		}
		else{
			printf("変換エラー\n");
			num = 0xFFFFFFFF;
			break;
		}
		num *= 16;
		num += ch;
		if(i1 >= 8){
			printf("値がオーバーしました\n");
			num = 0xFFFFFFFF;
			break;
		}
	}
	return(num);
}