掷骰子

 

#include<stdio.h>
#include<time.h>
#include<stdlib.h>
#include"dice.h"

int main(void){
    int dice,sides;//设置骰子个数和面数
    int roll;//最终结果

    srand((unsigned int)time(0));//设置一个伪随机数，当前时间当做种子
    printf("Enter the number of sides per die,0 to stop\n");
    while((scanf("%d",&sides)==1 && sides > 0))
    {
        puts("How many dice?");
        scanf("%d",&dice);
        roll = roll_n_dice(dice,sides);//调用程序模拟掷骰子
        printf("You have rolled a %d using %d %d-sides dice\n",roll,dice,sides);
        printf("Enter the number of sides per die,0 to stop\n");
    }
    printf("The rollem() function was called %d times.\n",roll_count);//打印投掷的总次数
    printf("GoodBye\n");

    getchar();
    return 0;
}

 

#include "dice.h"//将头文件放置在双引号中，表明“在本地寻找”
#include<stdio.h>
#include<stdlib.h>

int roll_count = 0;//定义一个外部链接静态变量，统计总的投掷数目
static int rollem(int sides){//将该函数设置为私有，只用于赋值roll_n_dice
    int roll;

    roll = rand() % 6 + 1;//rand产生从1到RAND_MAX的整数，调整下得到想要的范围！
    ++roll_count;
    return roll;
}
int roll_n_dice(int dice,int sides){
    int d;
    int total = 0;

    if(sides<2){
        printf("Need at least 2 sides\n");
        return -2;
    }
    if(dice<1){
        printf("Need at least 1 dice\n");
        return -1;
    }
    for(d=0;d<dice;d++){
        total += rollem(sides);
    }
    return total;
}

 

extern int roll_count;//设置一个全局变量
int roll_n_dice(int dice,int sides);//全局函数说明