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Anon25 [30]
3 years ago
12

Write the method addItemToStock to add an item into the grocery stock array. The method will: • Insert the item with itemName ad

d quantity items to stock. • If itemName is already present in stock, increase the quantity of the item, otherwise add new itemName to stock. • If itemName is not present in stock, insert at the first null position in the stock array. After the insertion all items are adjacent in the array (no null positions between two items). • Additionally, double the capacity of the stock array if itemName is a new item to be inserted and the stock is full.
Computers and Technology
1 answer:
garri49 [273]3 years ago
8 0

Answer:

#include <stdio.h>

#include <iostream>

using namespace std;

int main()

{

   //varible to indicate size of the array

   int size=20;

   //arrays to hold grocery item names and their quantities

   std::string grocery_item[size];

   int item_stock[size];

   //variables to hold user input

   std::string itemName;

   int quantity;

   //variable to check if item is already present

   bool itemPresent=false;

   //variable holding full stock value

   int full_stock=100;

   for(int n=0; n<size; n++)

   {

       grocery_item[n]="";

       item_stock[n]=0;

   }

   do

   {

       std::cout << endl<<"Enter the grocery item to be added(enter q to quit): ";

       cin>>itemName;

       if(itemName=="q")

       {

               cout<<"Program ends..."<<endl; break;

       }

       else

       {

           std::cout << "Enter the grocery item stock to be added: ";

           cin>>quantity;

       }

   for(int n=0; n<size; n++)

   {

       if(grocery_item[n]==itemName)

       {

           itemPresent=true;

           item_stock[n]=item_stock[n]+quantity;

       }

   }

   if(itemPresent==false)

   {

       for(int n=0; n<size; n++)

       {

           if(grocery_item[n]=="")

           {

               itemPresent=true;

               grocery_item[n]=itemName;

               item_stock[n]=item_stock[n]+quantity;

           }

       

           if(item_stock[n]==full_stock)

           {

               item_stock[n]=item_stock[n]*2;

           }

       }

   }

   }while(itemName!="q");

   return 0;

}

OUTPUT

Enter the grocery item to be added(enter q to quit): rice

Enter the grocery item stock to be added: 23

Enter the grocery item to be added(enter q to quit): bread

Enter the grocery item stock to be added: 10

Enter the grocery item to be added(enter q to quit): bread

Enter the grocery item stock to be added: 12

Enter the grocery item to be added(enter q to quit): q

Program ends...

Explanation:

1. The length of the array and the level of full stock has been defined inside the program.

2. Program can be tested for varying values of length of array and full stock level.

3. The variables are declared outside the do-while loop.

4. Inside do-while loop, user input is taken. The loop runs until user opts to quit the program.

5. Inside do-while loop, the logic for adding the item to the array and adding the quantity to the stock has been included. For loops have been used for arrays.

6. The program only takes user input for the item and the respective quantity to be added.

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Answer:

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Explanation:

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Create a program which will input data into a pipe one character at a time. Count the number of characters as they are written i
LenKa [72]

Answer:

a)

#include<stdio.h>

#include<stdlib.h>

#include<fcntl.h>

#include<unistd.h>

 

#define BUFSIZE 16

int main(){

   //pipe descriptors

   char msg[BUFSIZE];

   char buf[BUFSIZE];

   int pipefd[2];

   if(pipe(pipefd) == -1){

       //pipe creation error

       perror("pipe");

       exit(EXIT_FAILURE);

   }

   //pipe creation successfull

   //write four messages

   sprintf(msg , "apple");

   write(pipefd[1], msg, BUFSIZE);

   printf("Written %s\n", msg);

   sprintf(msg , "boy");

   write(pipefd[1], msg, BUFSIZE);

   printf("Written %s\n", msg);

   sprintf(msg , "cat");

   write(pipefd[1], msg, BUFSIZE);

   printf("Written %s\n", msg);

   sprintf(msg , "dog");

   write(pipefd[1], msg, BUFSIZE);

   printf("Written %s\n", msg);

   //read

   read(pipefd[0], buf, BUFSIZE);

   printf("Read: %s\n", buf);

   read(pipefd[0], buf, BUFSIZE);

   printf("Read: %s\n", buf);

   read(pipefd[0], buf, BUFSIZE);

   printf("Read: %s\n", buf);

   read(pipefd[0], buf, BUFSIZE);

   printf("Read: %s\n", buf);

   close(pipefd[0]);

   close(pipefd[1]);

   return 0;

}

(b)

#include<stdio.h>

#include<stdlib.h>

#include<fcntl.h>

#include<unistd.h>

#include<wait.h>

#define BUFSIZE 16

int main(){

   //pipe descriptors

   char msg[BUFSIZE];

   char buf[BUFSIZE];

   int pipefd[2];

   if(pipe(pipefd) == -1){

       //pipe creation error

       perror("pipe");

       exit(EXIT_FAILURE);

   }

   //pipe creation successfull

   //write four messages

   if(fork() == 0){

       //this is child

       //close unused write end

       close(pipefd[1]);

       read(pipefd[0], buf, BUFSIZE);

       printf("This is child process reading first message. Content is %s\n", buf);

       read(pipefd[0], buf, BUFSIZE);

       printf("This is child process reading second message. Content is %s\n", buf);

       read(pipefd[0], buf, BUFSIZE);

       printf("This is child process reading third message. Content is %s\n", buf);

       read(pipefd[0], buf, BUFSIZE);

       printf("This is child process reading fourth message. Content is %s\n", buf);

       close(pipefd[0]);

       //exit from child

       exit(EXIT_SUCCESS);

   }

   //this is parent process

   //close unused read end

   close(pipefd[0]);

   sprintf(msg , "apple");

   printf("This is parent process. Writing first message into pipe\n");

   write(pipefd[1], msg, BUFSIZE);

   sprintf(msg , "boy");

   printf("This is parent process. Writing second message into pipe\n");

   write(pipefd[1], msg, BUFSIZE);

   sprintf(msg , "cat");

   printf("This is parent process. Writing third message into pipe\n");

   write(pipefd[1], msg, BUFSIZE);

   sprintf(msg , "dog");

   printf("This is parent process. Writing fourth message into pipe\n");

   write(pipefd[1], msg, BUFSIZE);

   close(pipefd[1]);

   //wait for child

   wait(NULL);

   return 0;

}

(c)

#include<stdio.h>

#include<stdlib.h>

#include<fcntl.h>

#include<unistd.h>

#include<sys/wait.h>

#include<sys/types.h>

#include<signal.h>

typedef struct sigaction Sigaction;

unsigned long long size = 0;

void alarmhandler(int sig){

   //alarm fired writing blocked

   printf("Write blocked after %llu characters\n", size);

   exit(EXIT_SUCCESS);

}

int main(){

   //pipe descriptors

   int pipefd[2];

   if(pipe(pipefd) == -1){

       //pipe creation error

       perror("pipe");

       exit(EXIT_FAILURE);

   }

   //install handler

   sigset_t mask , prev;

   sigemptyset(&mask);

   sigaddset(&mask , SIGALRM);

   sigprocmask(SIG_BLOCK , &mask , &prev);

   Sigaction new_action;

   sigemptyset(&new_action.sa_mask);

   new_action.sa_flags = SA_RESTART;

   new_action.sa_handler = alarmhandler;

   sigaction(SIGALRM , &new_action , NULL);

   sigprocmask(SIG_SETMASK , &prev, NULL);

   while(1){

     

       //print size on multiple of 4

       if(size != 0 && size % 1024 == 0){

           printf("%llu characters in pipe\n", size);

       }

       //reset previous alarm

       alarm(0);

       //set new alarm for 5 seconds

       alarm(5);

       //write to pipe one character

       write(pipefd[1], "A", sizeof(char));

       size++;

   }

   return 0;

}

Explanation:

Output for a, b, c are pasted accordingly

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