#include?
#include?
#include?

struct?t_food?{
	char?name[128];		//食物名稱
	double??weight;		//食物的權(quán)重
	double??range_from;	//分布在隨機(jī)數(shù)取值范圍的空間?從
	double??range_to;	//分布在隨機(jī)數(shù)取值范圍的空間?到
}?food_list[128]?=?{
	{“白菜“??1?0?0}?
	{“茄子“??1?0?0}?
	{“土豆“??1?0?0}?
	{“紅薯“??5?0?0}?
	{“雞蛋“??5?0?0}?
	{““-1-1-1}
};

//?隨機(jī)數(shù)分布范圍是?[0-RAND_MAX]
//?每種食物的可能性為?1/（weight1+weight2+weight3+...+weightn）?*?100%
int?main（int?argcchar**argv）
{
	//算出所有食物的權(quán)重和
	double?totle_weight?=?0;
	for（int?i=0;food_list[i].weight!=-1;i++）{
		totle_weight?+=?food_list[i].weight;
	}
	printf（“totle?weight?:?%4.4f\n“totle_weight）;
	//算出每個(gè)食物的分布區(qū)間
	food_list[0].range_from?=?0;
	food_list[0].range_to	=?RAND_MAX*food_list[0].weight/totle_weight;
	printf（“%s?:?from?:?%5.5f?->?%5.5f\n“food_list[0].namefood_list[0].range_fromfood_list[0].range_to）;
	for（int?i=1;food_list[i].weight!=-1;i++）{
		food_list[i].range_from?=?food_list[i-1].range_to;
		food_list[i].range_to	=?food_list[i-1].range_to?+?RAND_MAX*food_list[i].weight/totle_weight;
		printf（“%s?:?from?:?%5.5f?->?%5.5f\n“food_list[i].namefood_list[i].range_fromfood_list[i].range_to）;
	}

	//種一個(gè)隨機(jī)數(shù)
	srand（GetTickCount（））;
	int?r?=?rand（）;
	int?times?=?1;
	if（?argc?>?1?）
		times?=?atoi（argv[1]）;
	for（?int?i=0?;?i	{
		//種一個(gè)隨機(jī)數(shù)生成一個(gè)隨機(jī)數(shù)
		srand（r）;?r?=?rand（）;
		printf（“today?rand?number?:?%d/%d\n“rRAND_MAX）;
		//查看落在哪個(gè)區(qū)間段
		for（int?i=0;food_list[i].weight!=-1;i++）{
			if（?（?food_list[i].range_from?<=?r?）?&&?（?r?<=?food_list[i].range_to?）?）
				printf（“今天的食物是?:?%s\n“food_list[i].name?）;
		}
	}

	return?0;
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件???????1770??2010-01-19?15:46??autofood.cpp

?????文件?????????80??2010-01-19?15:47??makefile

?????文件????????239??2010-01-19?15:53??readme.txt

-----------?---------??----------?-----??----

?????????????????2089????????????????????3