你用scanf接受数据的时候应该是scanf("%c",&ch2);两处都要改的！

#include<stdio.h>
#include<conio.h>
#include<time.h>
#include<stdlib.h>
#include<ctype.h>
int main()
{
    int red[33],blue[16],num1=6,num2=1,max_mid1=33,max_mid2=16,i,j;
    int chosered[6],choseblue,choice_r,choice_b;
    char ch1,ch2;
    printf("**********欢迎购买中国福利彩票------双色球**************\n");
    printf("~~~~奉献一份爱心，收获一份意外的喜悦，祝你好运！~~~~~~~~~~~~~~\n" );
    printf("          您是否采用机选(y/n):");
    [color=FF00FF]scanf("%c",&ch1);[/color]
    if (toupper(ch1)=='Y')
    {
        do
        {
            for (i=0;i<max_mid1;i++)  /*所有的红球*/
            {
                red[i]=i+1;
            }
            srand((unsigned)time(NULL));  /*随机取出6红球*/
            for (i=0;i<num1;i++)
            {
                choice_r=rand()%max_mid1;
                chosered[i]=red[choice_r];
                for (j=choice_r;j<max_mid1;j++)
                {
                    red[j]=red[j+1];
                }
                max_mid1--;
            }
            for (i=0;i<max_mid2;i++) /*所有的蓝球*/
            {
                blue[i]=i+1;
            }
            srand((unsigned)time(NULL));  /*随机取出1蓝球*/
            choice_b=rand()%max_mid2;
            choseblue=blue[choice_b];
            printf("本注双色球机选的号码为："); /*号码输出*/
            printf("红球为：");
            for (i=0;i<num1;i++)
            {
                printf("   %d",chosered[i]);
            }
            printf("   蓝球为：%d",choseblue);
            printf("是否再选一注(y/n)");
            [color=FF0000]scanf("%c",&ch2);[/color]        }
        while (toupper(ch2)=='Y');
    }
    else
    {
        printf("请输入你所选的号码");
    }
    getch();
    return 0;
}

xie xie

为什么循环不行啊

#include<stdio.h>
#include<conio.h>
#include<time.h>
#include<stdlib.h>
#include<ctype.h>
int main()
{
    int red[33],blue[16],num1=6,num2=1,max_mid1=33,max_mid2=16,i,j;
    int chosered[6],choseblue,choice_r,choice_b;
    char ch1,ch2;

    printf("**********欢迎购买中国福利彩票------双色球**************\n");
    printf("~~~~奉献一份爱心，收获一份意外的喜悦，祝你好运！~~~~~~~~~~~~~~\n" );
    printf("          您是否采用机选(y/n):");
    scanf("%c",&ch1);
    if (toupper(ch1)=='Y')
    {
        do
           {
            printf("机选开始\n");
            for (i=0;i<max_mid1;i++)  /*所有的红球*/
            {
                red[i]=i+1;
            }
            srand((unsigned)time(NULL));  /*随机取出6红球*/
            for (i=0;i<num1;i++)
            {
                choice_r=rand()%max_mid1;
                chosered[i]=red[choice_r];
                for (j=choice_r;j<max_mid1;j++)
                {
                    red[j]=red[j+1];
                }
                max_mid1--;
            }
            for (i=0;i<max_mid2;i++) /*所有的蓝球*/
            {
                blue[i]=i+1;
            }
            srand((unsigned)time(NULL));  /*随机取出1蓝球*/
            choice_b=rand()%max_mid2;
            choseblue=blue[choice_b];
            printf("本注双色球机选的号码为："); /*号码输出*/
            printf("红球为：");
            for (i=0;i<num1;i++)
            {
                printf("   %d",chosered[i]);
            }
            printf("   蓝球为：%d",choseblue);
            printf("\n是否再选一注(y/n)");   
            fflush(stdin);   
            scanf("%c",&ch2);
           }while(toupper(ch2)=='Y');
    }
    else
    {
        printf("请输入你所选的号码");
    }
    getch();
    return 0;
}

再次输入要刷新缓冲区
现在循环可以运行

你好.我是全职网赚工作者.
如果你有时间有电脑.
想在网络上创业.请联系我..
项目绝对真实.详情QQ空间资料
加盟请联系 QQ908889846