Question

This week you will write a program that mimics an online shopping cart . You will use all the programming techniques we have learned thus far this semester, including if statements, loops, lists and functions. It should include all of the following:

The basics - Add items to a cart until the user says "done" and then print out a list of items in the cart and a total price.

- Ensure the user types in numbers for quantities
- "Hardcode" the price of items into a list and pick from it randomly for each item
- Get the user's name and shipping address
- Separate functions that compute tax and shipping costs and returns their values to the main program

Answer 1

Answer:

Note: I've used simple C programming concepts like for loop, if else conditions, switch cases for Menu etc. Program is quite simple to understand and if you are having any trouble, please do let me know by commenting down below:

Source Code:

#include<stdio.h>
#include<string.h>
main()
{
 static int totalCost;
 int i,j,choice,c=1,a[9],cost[9];
 for(i=0;i<9;i++)
 a[i]=0;
 
 char str[100];
 char items[9][100]={"Sandisk 16 GB",
 "Logitech Mouse",
 "Pendrve 32 GB",
 "Adidas",
 "Nike",
 "Leecooper",
 "Mi Note 3",
 "Nokia 3",
 "Samsung"  
 };
 printf("Please Enter Your Name\n");
 gets(str);
 printf("Hello %s, Welcome to our Online Shopping.\n",str);
 do{
  //C is 1 by default
  if(c==1){
  printf("Enter\n1 - Computer Accessories\n2 - Shoes\n3 - Mobiles\nAny other number to exit\n");
  scanf("%d",&choice);
  switch(choice)
  {
   case 1:
   {
    int accessoriesChoice;
    printf("Enter\n1 - Sandisk 16 GB - Rs.355\n2 - Logitech Mouse- Rs.500\n3 - Pendrive 16 GB - Rs.550\nAny other number to exit\n");
    scanf("%d",&accessoriesChoice);
    cost[0]=355;
    cost[1]=500;
    cost[2]=550;
    switch(accessoriesChoice)
    {
     case 1:
     {
      int num;
      printf("You chose Sandisk 16GB with Rs.355.Are you sure to buy.If 'Yes' Enter 1 else any number\n");
      scanf("%d",&num);
      if(num==1)
      {
       a[0]++;
       totalCost+=355;
      }
      printf("Your Cost in Cart is %d\n",totalCost);
      break;
     }
     case 2:
     {
      int num;
      printf("You chose Logitech Mouse with Rs.500.Are you sure to buy.If 'Yes' Enter 1 else any number\n");
      scanf("%d",&num);
      if(num==1)
      {
       a[1]++;
       totalCost+=500;
      }
      printf("Your Cost in Cart is %d\n",totalCost);
      break;
     }
     case 3:
     {
      int num;
      printf("You chose Pendrive 16GB with Rs.550.Are you sure to buy.If 'Yes' Enter 1 else any number\n");
      scanf("%d",&num);
      if(num==1)
      {
       a[2]++;
       totalCost+=550;
      }
      printf("Your Cost in Cart is %d\n",totalCost);
      break;
     }
     default:{
      printf("Exit from Computer Accesories\n");
      break;
     }
    }
    break;
   }
   case 2:
   {
    int shoesChoice;
    printf("Enter\n1 - Adidas - Rs.3550\n2 - Nike - Rs.5000\n3 - Leecooper - Rs.2800\nAny other number to exit\n");
    scanf("%d",&shoesChoice);
    cost[3]=3550;
    cost[4]=5000;
    cost[5]=2800;
    switch(shoesChoice)
    {
     case 1:
     {
      int num;
      printf("You chose Adidas Shoes for Rs.3550.Are you sure to buy.If 'Yes' Enter 1 else any number\n");
      scanf("%d",&num);
      if(num==1)
      {
       a[3]++;
       totalCost+=3550;
      }
      printf("Your Cost in Cart is %d\n",totalCost);
      break;
     }
     case 2:
     {
      int num;
      printf("You chose Nike Shoes for Rs.5000.Are you sure to buy.If 'Yes' Enter 1 else any number\n");
      scanf("%d",&num);
      if(num==1)
      {
       a[4]++;
       totalCost+=5000;
      }
      printf("Your Cost in Cart is %d\n",totalCost);
      break;
     }
     case 3:
     {
      int num;
      printf("You chose Leecooper Shoes for Rs.2800.Are you sure to buy.If 'Yes' Enter 1 else any number\n");
      scanf("%d",&num);
      if(num==1)
      {
       a[5]++;
       totalCost+=2800;
      }
      printf("Your Cost in Cart is %d\n",totalCost);
      break;
     }
     default:{
      printf("Exit from Shoes Category\n");
      break;
     }
    }
    break;
   }
   case 3:
   {
    int mobileChoice;
    printf("Enter\n1 - Mi Note 3 - Rs.11000\n2 - Nokia 3 - Rs.9866\n3 - Samsung - Rs.12800\nAny other number to exit\n");
    scanf("%d",&mobileChoice);
    cost[6]=11000;
    cost[7]=9866;
    cost[8]=12800;
    switch(mobileChoice)
    {
     case 1:
     {
      int num;
      printf("You chose to buy Mi Note 3 for Rs.11000.Are you sure to buy.If 'Yes' Enter 1 else any number\n");
      scanf("%d",&num);
      if(num==1)
      {
       a[6]++;
       totalCost+=11000;
      }
      printf("Your Cost in Cart is %d\n",totalCost);
      break;
     }
     case 2:
     {
      int num;
      printf("You chose to buy Nokia 3 for Rs.9866.Are you sure to buy.If 'Yes' Enter 1 else any number\n");
      scanf("%d",&num);
      if(num==1)
      {
       a[7]++;
       totalCost+=9866;
      }
      printf("Your Cost in Cart is %d\n",totalCost);
      break;
     }
     case 3:
     {
      int num;
      printf("You chose to buy Samsung for Rs.12800.Are you sure to buy.If 'Yes' Enter 1 else any number\n");
      scanf("%d",&num);
      if(num==1)
      {
       a[8]++;
       totalCost+=12800;
      }
      printf("Your Cost in Cart is %d\n",totalCost);
      break;
     }
     default:{
      printf("Exit from Mobile Category\n");
      break;
     }
    }
    break;
   }
   default:
   {
    printf("Enter Valid Categories Choice\n");
    break;
   }
  }
  printf("%s's cart\n",str);
  printf("Id\tItems\t\tQuantity\tCost\n");
  for(i=0;i<9;i++)
  {
   if(a[i]!=0)
   {
    printf("%d\t%s\t\t%d\t\t\t%d\n",i,items[i],a[i],(cost[i]*a[i]));
   }
  }
  printf("Total Cost\t\t\t\t\t%d\n",totalCost);
  printf("If you wish to buy anything more Enter\n1 to Add Item\n2 to Delete Items\n3 to Change Quantity \nAny other number to Exit\n");
  scanf("%d",&c);
 }
  if(c==2)
  {
   int id;
   printf("Enter id to delete item\n");
   scanf("%d",&id);
   if(id<9&&id>0){
   totalCost=totalCost-(cost[id]*a[id]);
   a[id]=0;
   }
   else{
    printf("Enter Valid id\n");
   }
       printf("Revised Items \n");
       printf("Id\tItems\t\tQuantity\tCost\n");
            for(i=0;i<9;i++)
      {
     if(a[i]!=0)
      {
    printf("%d\t%s\t%d\t\t%d\n",i,items[i],a[i],(cost[i]*a[i]));
      }
     }
        printf("Total Cost\t\t\t\t\t%d\n",totalCost);
        printf("If you wish to buy anything more Enter\n1 to Add Item\n2 to Delete Items\n3 to Change Quantity \nAny other number to Exit\n");
     scanf("%d",&c);
  }
  if(c==3)
  {
   int id,quantity;
   printf("Enter id to Change quantity of an item\n");
   scanf("%d",&id);
   printf("Enter quantity to be changed of an item\n");
   scanf("%d",&quantity);
   if(id<9&&id>0){
    if(quantity>0 && a[id]>0){  
        if(quantity<a[id]) 
     {
      int dec=a[id]-quantity;
      a[id]=quantity;
       totalCost=totalCost-(cost[id]*dec); 
     }
     if(quantity>a[id]) 
     {
      int inc=quantity-a[id];
      a[id]=quantity;
       totalCost=totalCost+(cost[id]*inc); 
     }
     if(quantity==a[id]) 
     {
      a[id]=quantity;
       totalCost=totalCost+0; 
     }   
           
    }
    else{
       printf("Item has no Quantity.Please Try again\n");
    }
     }
     else{
    printf("Enter Valid id\n");
   }
       printf("Revised Items \n");
       printf("Id\tItems\t\tQuantity\tCost\n");
            for(i=0;i<9;i++)
      {
     if(a[i]!=0)
      {
    printf("%d\t%s\t%d\t\t%d\n",i,items[i],a[i],(cost[i]*a[i]));
      }
     }
        printf("Total Cost\t\t\t\t\t%d\n",totalCost);
        printf("If you wish to buy anything more Enter\n1 to Add Item\n2 to Delete Items\n3 to Change Quantity \nAny other number to Exit\n");
     scanf("%d",&c);
  }
 }while(c==1 || c==2 ||c==3);
 printf("Your Final Cost is %d\n",totalCost);
 printf("Thanks %s for Choosing Us and Visit us again.\n",str);
 
}

Output:

Let me know if you have any doubts or if you need anything to change. 

If you are satisfied with the solution, please leave a +ve feedback : ) Let me know for any help with any other questions.

Thank You!
===========================================================================