153_1.c

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

int change_count=0;
struct advertisment
{
    char message_sent[100];
    int time[2];
};
typedef struct advertisment ADV;

struct stack
{
    int top;
    int active;
    ADV items[6];
}S1,S2;

typedef struct stack STACK;

STACK createStack()
{
    STACK st;
    st.top = -1;
    st.active = 0;
    return st;
}

int isEmpty(STACK stack)
{
    if(S1.top==-1)
    {
        S1.active = 0;
        S2.active = 1;
    }
    else
    {
        S1.active = 1;
        S2.active = 0;
    }
    return stack.top == -1;
}

STACK push(STACK stack,ADV item)
{
    stack.items[++stack.top] = item;
    return stack;
}

STACK pop(STACK stack)
{
    S2=push(S2,stack.items[stack.top]);
    stack.top--;
    return stack;
}

int main()
{
    int choice;
    S1 = createStack();
    S2 = createStack();
    ADV items[6] = {
                    [0].message_sent  = "Have Your Snacks at nearest hotels",
                    [0].time[0]       = 8,
                    [0].time[1]       = 9,
                    [1].message_sent  = "Have a cup of Coffee, To start your day",
                    [1].time[0]       = 9,
                    [1].time[1]       = 10,
                    [2].message_sent  = "Shop for your Newborn angels",
                    [2].time[0]       = 10,
                    [2].time[1]       = 11,
                    [3].message_sent  = "Shop until you are statisfied, Heavy diwali discount",
                    [3].time[0]       = 11,
                    [3].time[1]       = 12,
                    [4].message_sent  = "Watch a movie to make your day",
                    [4].time[0]       = 12,
                    [4].time[1]       = 1,
                    [5].message_sent  = "Hungry, try out our exotic lunch menu",
                    [5].time[0]       = 1,
                    [5].time[1]       = 2,
                };
    S1=push(S1,items[5]);
    S1=push(S1,items[4]);
    S1=push(S1,items[3]);
    S1=push(S1,items[2]);
    S1=push(S1,items[1]);
    S1=push(S1,items[0]);
    S1.active = 1;

    while(1)
    {
        if(change_count>=5) isEmpty(S1);
        printf("------------------Message------------------\n");
        printf("1.Message Being Brodcasted                 \n");
        printf("2.Update Time                              \n");
        printf("3.Print Message Left Over                  \n");
        printf("4.Print All Message                        \n");
        printf("5.Exit                                     \n");
        printf("-------------------------------------------\n");
        printf("Enter Your Choice : ");
        scanf("%d",&choice);
        switch(choice)
        {
            case 1  : if(S1.active == 1)
                        printf("Current Message : \n%s\n",S1.items[S1.top].message_sent);
                      else
                        printf("Current Message : \n%s\n",S2.items[S2.top].message_sent);
                      break;

            case 2  : if(S1.active == 1)
                      {
                        S1=pop(S1);
                        printf("Time Updated!!!!!\nCurrent Message : \n%s\n",S1.items[S1.top].message_sent);
                      }
                      else
                      {
                        S2=pop(S2);
                        printf("Time Updated!!!!!\nCurrent Message : \n%s\n",S2.items[S2.top].message_sent);
                      }
                      break;

            case 3  : if(S1.active == 1)
                      {
                        printf("Remaining Messages : \n\n");
                        for(int i=S1.top;i>=0;i--)
                          printf("%d. %s\n",S1.top-i+1,S1.items[i].message_sent);
                      }
                      else
                      {
                        printf("Remaining Messages : \n\n");
                        for(int i=S2.top;i>=0;i--)
                          printf("%d. %s\n",S2.top-i+1,S2.items[i].message_sent);
                      }
                      break;

            case 4  : printf("\nRemaining Messages in Stack1 : \n\n");
                      for(int i=S1.top;i>=0;i--)
                        printf("%d. %s\n",S1.top-i+1,S1.items[i].message_sent);
                      printf("\n\nRemaining Messages in Stack2 : \n\n");
                      for(int j=S2.top;j>=0;j--)
                        printf("%d. %s\n",S2.top-j+1,S2.items[j].message_sent);
                      break;

            case 5  : exit(0);

            default : printf("Wrong Choice Enter Again...\n");
                      break;
        }
        system("pause");
        system("cls");
    }
    return 0;
}