cvthex.cpp

空战游戏flacon源码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <io.h>
#include <math.h>

inline int ConvertHex (char c) {
	if (c >= '0' && c <= '9')
		return c - '0';
	else if (c >= 'a' && c <= 'f')
		return c - 'a' + 10;
	else if (c >= 'A' && c <= 'F')
		return c - 'A' + 10;
	return 0;
}

void main (int argc, char *argv[])
{
	printf ("CVTHex v1.0 by Erick Jap\n");
	if (argc < 2) {
		puts ("Usage: CVTHex hexnum");
		exit (1);
	}
	union {
		char	buf[8];
		double	fnum;
	};
	buf[7] = (ConvertHex (argv[1][0]) << 4) + ConvertHex (argv[1][1]);
	buf[6] = (ConvertHex (argv[1][2]) << 4) + ConvertHex (argv[1][3]);
	buf[5] = (ConvertHex (argv[1][4]) << 4) + ConvertHex (argv[1][5]);
	buf[4] = (ConvertHex (argv[1][6]) << 4) + ConvertHex (argv[1][7]);
	buf[3] = (ConvertHex (argv[1][8]) << 4) + ConvertHex (argv[1][9]);
	buf[2] = (ConvertHex (argv[1][10]) << 4) + ConvertHex (argv[1][11]);
	buf[1] = (ConvertHex (argv[1][12]) << 4) + ConvertHex (argv[1][13]);
	buf[0] = (ConvertHex (argv[1][14]) << 4) + ConvertHex (argv[1][15]);
	printf ("Double %f\n", fnum);
}