lotto.c

C.Game.Programming.For.Dummies.原码

#include <stdio.h>
#include <stdlib.h>
#include <time.h>	//for the seedrnd() function

#define RANGE 50	//number of numbers
#define BALLS 6		//number of balls to draw
#define DELAY 1000000	//delay interval between picks

int rnd(int range);
void seedrnd(void);

void main()
{
	int numbers[RANGE];	//array that holds the balls
	int i,b;
	unsigned long d;	//delay variable

	printf("L O T T O   P I C K E R\n\n");
	seedrnd();		//seed the randomizer

/* initialize the array */

	for(i=0;i<RANGE;i++)	//initialize the array
		numbers[i]=0;

	printf("Press Enter to pick this week's numbers:");
	getchar();

/* draw the numbers */
	printf("\nHere they come: ");
	for(i=0;i<BALLS;i++)
	{
		for(d=0;d<=DELAY;d++);	//pause here

/* picks a random number and check to
see if it's already been picked */

        do
		{
			b=rnd(RANGE);	//draw number
		}
		while(numbers[b]);	//already drawn?

		numbers[b]=1;		//mark it as drawn
		printf("%i ",b+1);	//add one for zero
	}
	printf("\n\nGood luck in the drawing!\n");
}

/* Generate a random value */

int rnd(int range)
{
	int r;

	r=rand()%range;		//spit up random num.
	return(r);
}

/* Seed the randomizer */

void seedrnd(void)
{
	srand((unsigned)time(NULL));
}