Question

Language:C++

Program:Visual basic

I have errors on line 102 "expression must have a constant value

line 107,108,123,124,127,128: array type int[n] not assignable

#include<iostream>
#include <fstream>
using namespace std;
#define size 10000

// Displays the current Inventory Data
void Display(int box_nums[],int nboxes[],double ppBox[],int n) // Prints Box number , number of boxes and price per box.
{
cout<<"Box number Number of boxes in stock Price per box"<<"\n";
cout<<"-------------------------------------------------------------\n";
for(int i=0; i<n; i++)
{
cout<<box_nums[i]<<" "<<nboxes[i]<<" "<<ppBox[i]<<"\n";
}
}

// sort's the inventory data according to the price per box from low to high
void sortByPrice(int box_nums[],int nboxes[],double priceBox[],int n)
{
int i, j, min_idx , temp2;
double temp;
for (i = 0; i < n-1; i++)
{
min_idx = i; // min_idx is used to store data in ascending order
for (j = i+1; j < n; j++) // used selection sort to sort the data based on price per box
{
if (priceBox[j] < priceBox[min_idx])
min_idx = j;
}
temp = priceBox[min_idx];
priceBox[min_idx] = priceBox[i]; // temp is a variable to swap data
priceBox[i] = temp;

temp2 = nboxes[min_idx];
nboxes[min_idx] = nboxes[i]; // temp2 is a variable to swap data
nboxes[i] = temp2;

temp2 = box_nums[min_idx];
box_nums[min_idx] = box_nums[i];
box_nums[i] = temp2;
  
}   
}

// sort's the inventory data according to Box number from low to high
void sortByBoxNumber(int box_nums[],int nboxes[],double priceBox[],int n)
{
int i, j, min_idx , temp2;
double temp;
for (i = 0; i < n-1; i++)
{
min_idx = i; // min_idx is used to store data in ascending order
for (j = i+1; j < n; j++)
{
if (box_nums[j] < box_nums[min_idx]) // used selection sort to sort the data based on price per box
min_idx = j;
}

temp2 = box_nums[min_idx];
box_nums[min_idx] = box_nums[i];
box_nums[i] = temp2;

temp = priceBox[min_idx];
priceBox[min_idx] = priceBox[i];
priceBox[i] = temp;

temp2 = nboxes[min_idx];
nboxes[min_idx] = nboxes[i];
nboxes[i] = temp2;
}   
}

// Searches for the price per box of the corresponding box number entered by user.
double lookUpByBoxNumber(int boxNumber,int box_nums[],double priceBox[],int n)
{
int low =0, high = n-1;
int mid;
while(low <= high) // used binary search to search for the corresponding box number and its price-per-box
{
mid = low + (high-low)/2;

if(box_nums[mid] > boxNumber)
{
high = mid - 1;
}
else if(box_nums[mid] == boxNumber)
{
return priceBox[mid];
}
else
{
low = mid + 1;
}
  
}
return -1;
}

//Reordered the data whose number of boxes are less than 100
void reorderReport(int box_nums[],int nboxes[],int n)
{
int reorderBoxNums[n],reorderBoxes[n],k=0;
for(int i=0; i<n; i++)
{
if(nboxes[i] < 100)
{
reorderBoxNums[k] = box_nums[i];
reorderBoxes[k] = nboxes[i];
k++;
}
}
int i, j, max_idx , temp2;
for (i = 0; i < k-1; i++) // sorts the data in reordered data according to number of boxes in inventory from low to high
{
max_idx = i;
for (j = i+1; j < k; j++)
{
if (reorderBoxes[j] > reorderBoxes[max_idx])
max_idx = j;
}

temp2 = reorderBoxes[max_idx];
reorderBoxes[max_idx] = reorderBoxes[i];
reorderBoxes[i] = temp2;

temp2 = reorderBoxNums[max_idx];
reorderBoxNums[max_idx] = reorderBoxNums[i];
reorderBoxNums[i] = temp2;
}
cout<<"REORDERED REPORT IS: \n";
cout<<"The boxes in invetory whose stock are less than 100 are: \n";
cout<<"Box number Number of boxes in stock"<<"\n";
cout<<"------------------------------------------"<<"\n";
for(int i=0 ; i<k; i++)
{
cout<<reorderBoxNums[i]<<" "<<reorderBoxes[i]<<"\n";
}
}
int main()
{

std::fstream myfile("inventory.txt");
int box_number[size] , numberOfBoxes[size] ;
double pricePerBox[size],sp;
int bn ,nb,i = 0;
while(myfile >> bn >> nb >> sp) // fetch data from file inventory.txt
{
box_number[i] = bn;
numberOfBoxes[i] = nb;
pricePerBox[i] = sp;
i++;
}

int n = i, bnumber ; // n stores number of records in file , bnumber is the box number which is to be searched for price-per-box by user
double val; // val is variable used for value stored from lookup by box-number
char option;
bool exit = true; // exit variable to exit the while loop

// Menu for the user
cout<<"\nChoose a option in the Menu a/b/c/d/e/f :"<<"\n";
cout<<"a. Display the data"<<"\n";
cout<<"b. Sort data by price, low to high"<<"\n";
cout<<"c. Sort data by box number, low to high"<<"\n";
cout<<"d. Look up the Price of the box given the box number"<<"\n";
cout<<"e. Generate Reorder Report"<<"\n";
cout<<"f. Exit"<<"\n";

while(exit)
{
cout<<"Enter your choice a/b/c/d/e/f : ";
cin>>option;

switch(option)
{
case 'a':
Display(box_number,numberOfBoxes,pricePerBox,n);
break;
case 'b':
sortByPrice(box_number,numberOfBoxes,pricePerBox,n);
cout<<"Data has been Successfully sorted by price"<<"\n";
cout<<"Please, choose option 'a' to display sorted data"<<"\n";
break;
case 'c':
sortByBoxNumber(box_number,numberOfBoxes,pricePerBox,n);
cout<<"Data has been Successfully sorted by Box Number"<<"\n";
cout<<"Please, choose option 'a' to display sorted data"<<"\n";
break;
case 'd':
sortByBoxNumber(box_number,numberOfBoxes,pricePerBox,n);
cout<<"Enter the box number for which you want to search the price : ";
cin>>bnumber;
val = lookUpByBoxNumber(bnumber,box_number,pricePerBox,n);
if(val < 0)
{
cout<<"There is no price of the box for the box number you are searching for\n";
}
else
{
cout<<"The price-per-box of the Box-Number you searched is "<<val<<"\n";
}
break;
case 'e':
reorderReport(box_number,numberOfBoxes,n);
break;
case 'f':
exit = false;
break;
default :   
cout<<"Invalid options , enter a valid option"<<"\n";
break;

}

}
return 0;
}

Answer 1

The given code is working just fine.

Program Sample Run: