模拟售票系统（在Turbo 2.01中测试的）。 程序开始会提示输入 1 还是 2 ，1代表座位（1--5）， 2代表座位（6--10）。程序红色部分会连续输出两次，不知道为什么； 还有输入1的次数等于6了，再输入2只能输入3次，按原来的想法应该还能输入4次的，调试了很久也没能让程序按想法运行， 请高手指点一下， 谢谢！！

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

int roll1 (void);
int roll2 (void);

main()
{
    int x[11]={0};
    int b, c, d=0, e=0;
    char h;
   
    printf("Please type 1 for \"smoking\"\n");
    printf("Please type 2 for \"nosmoking\"\n");
    scanf("%d", &c);
   
    srand(time(NULL));
    while(d<5 || e<5)         
    {
        if(c==1)          /*c=1 在1到5中随机挑选一个数*/
        {
            d++;
            if(d<=5)
            {
                b=roll1();
                while(x[b]!=0)  /*x[b]!=0 说明票已售出*/
                    b=roll1();
                if(x[b]==0)
                {
                    ++x[b];        
                    printf("The set at \"somking\", the number is %d\n", b);
                    printf("Please type 1 for \"smoking\"\n");
                    printf("Please type 2 for \"nosmoking\"\n");
                    scanf("%d", &c);
                }
            }
            if(d>5)
            {
                e++;
                if(e<5)
                {
                    printf("Do you want to have a set for \"nosmoking\" (y or n): ");
                    scanf("%c", &h);
                    if(h=='y')
                    {
                        b=roll2();
                        while(x[b]!=0)
                            b=roll2();
                        if(x[b]==0)
                        {
                            ++x[b];
                            printf("The set at \"nosmoking\", the number is %d\n", b);
                            printf("Please type 1 for \"smoking\"\n");
                            printf("Please type 2 for \"nosmoking\"\n");
                            scanf("%d", &c);
                        }
                    }
               
                    if(h=='n')
                    {
                        printf("Next flight leaves in 3 hours.\n");
                        printf("\nPlease type 1 for \"smoking\"\n");
                        printf("Please type 2 for \"nosmoking\"\n");
                        scanf("%d", &c);
                    }
                }
            }
        }
        
        if(c==2)           /*c=2 在6到10中随机挑选一个数*/
        {
            e++;
            if(e<=5)
            {
                b=roll2();
                while(x[b]!=0)   
                    b=roll2();
                if(x[b]==0)
                {
                    ++x[b];
                    printf("The set at \"nosmoking\", the number is %d\n", b);
                    printf("Please type 1 for \"smoking\"\n");
                    printf("Please type 2 for \"nosmoking\"\n");
                    scanf("%d", &c);
                }
            }
            if(e>5)
            {
                d++;
                if(d<5)
                {
                    printf("Do you want to have a set for \"somking\" (y or n): ");
                    scanf("%c", &h);
                    if(h=='y')
                    {
                        b=roll1();
                        while(x[b]!=0)
                            b=roll1();
                        if(x[b]==0)
                        {
                            ++x[b];
                            printf("The set at \"smoking\", the number is %d\n", b);
                            printf("Please type 1 for \"smoking\"\n");
                            printf("Please type 2 for \"nosmoking\"\n");
                            scanf("%d", &c);
                        }
                    }
                    if(h=='n')
                    {
                        printf("Next flight leaves in 3 hours.\n");
                        printf("Please type 1 for \"smoking\"\n");
                        printf("Please type 2 for \"nosmoking\"\n");
                        scanf("%d", &c);
                    }
                }
            }
        }
    }
    if(d>=5 && e>=5)
        printf("Sorry, the flight is full! Next flight leaves in 3 hours.\n");
   
    system("pause");
}

int roll1 (void)
{
    int roll;
    roll=1+rand()%5;
    return roll;
}

int roll2 (void)
{
    int roll;
    roll=6+rand()%5;
    return roll;
}

注意下：scanf()会接受键盘缓冲区的回车键！

在scanf("%c",&h);前面加上一句 getchar(); 应该就可以了。你试试看。希望能帮到你 。

以茶代酒，敬两位一杯。