What's wrong with my Code?

Question

#include <iostream>
#include <iomanip>
using namespace std;

struct inventoryBin
{
string partDesc;
int numPart;

~inventoryBin(); //deconstructor

};

enum options
{
ADD_Parts =1, REMOVE_PARTS = 2, SHOW_INVENTORY = 3, QUIT = 4
};

void menu(InventoryBin invBins[], const int BINS);
void addParts(Inventory invBins[], const int selection, const int MAX_PARTS, const int BINS);
void removeParts(inventoryBin invBins[], const int selection);
int getBinId(const int BINS);
void showInventory;//displayBins

void showInventory(inventoryBin invBins[], const int BINS)
{
cout << "\tBIN:\t Part Description"
<< setw(31) << right << "Number of Parts\n\n";

for(int index = 0; index < BINS; index++)
{
cout << "\t";
cout << setw(12) << left << (index+1)
cout << setw(15) << left << invBins[index].partDesc
<< setw(30) << right << invBins[index].numPart << "\n";
}
}

int getBinId(const int BINS)
{
int binID = 0;

cout << "\n\t Enter Bin Number: ";
cin >> binID;

while(binID < 1 || binID > BINS)
{
cout << "\n\tEnter Bin Number: ";
cin >> binId;
}
return binID -=1;
}

void addParts(Inventory invBins[], const int selection, const int MAX_PARTS, const int BINS)
{
int add = 0;

cout << "\n\t Enter number of parts to add: ";
cin >> add

while(add < 0)
{
cout << "\tEnter a number of parts to add: ";
cin >> add;
}

while (invBins[selection].numParts + add > MAX_PARTS)
{
cout << "\nMaximum Part of Number 30 items\n\n";
cin >> add;
}

if(invBins[selection].numParts + add <= MAX_PARTS)
{
invBins[selection].numParts += add;
}
}

void removeParts(inventoryBin invBins[], const int selection)
{
int remove = 0;
cout << "\n\tEnter number of parts to remove: ";
cin >> remove;

while(remove < 0)
{
cout << "\tEnter number of parts to

Answer 1

The code is truncated and without important information. Let's make it right:
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This makes it possible for us to help.

Answer 2

void removeParts(inventoryBin invBins[], const int selection)
{
int remove = 0;
cout << "\n\tEnter number of parts to remove: ";
cin >> remove;

while(remove < 0)
{
cout << "\tEnter number of parts to remove: ";
cin >> remove;
}

while(invBins[selection].numParts - remove < MIN_PARTS)
{
cout << "\n\t too many parts selected \n\n";
<< "\tEnter number of parts to remove: ";
cin >> remove;
}

if(invBins[selection].numParts - remove >= MIN_PARTS)
{
invBins[selection.numparts -= remove];
}
}

void menu(InventoryBin invBins[], const int BINS)
{
const int MAX_PARTS = 30;
const int MIN_PARTS = 0;
int selection = 0;
int binID = 0;

showInventory(invBins, BINS);

do
{
cout << "\n Select [1] to add items\n";
cout << "\n Select [2] to remove items\n";
cout << "\n Select [3] to display items\n";
cout << "\n Select [4] to Quit\n";

cin >> selection;

while(selection < ADD_PARTS || selection < quit)
{
cout << "\tSelect";
cin >> selection;
}
switch(selection)
{
case ADD_PARTS;
{
binID = getBinID(BINS);

if(invBins[binID],numParts != MAX_PARTS)
{
addParts(invBins, binID, MAX_PARTS, BINS)
}
clearScreen();
displayBins(invBins, BINS)
}break;
}

case REMOVE_PARTS;
{
binID = getBinId(BINS)
if(invBins[binID].numParts != MIN_PARTS)
{
removeParts(invBins, binID, MIN_PARTS, BINS)
}
clearScreen();
}break;

case SHOW_INVENTORY:
{
SHOW_INVENTORY();
}

case QUIT;

}while(selection != QUIT);

}

int main()
{
const int BIN = 10;

inventoryBin[BIN] = {
//1{"Valve". 10},
//2{"Bearing", 5"},
//3{"Bushing", 15},
//4{"Coupling", 2