Binary Search Implementation in C-CodePudding

I have written a program which should do the following:

read product item data from an inventory file and add them in a vector object. The program will allow user to view, search and order the product items. The inventory file should be updated after the order of any item.

For operation #2 (searching) and #3 (ordering), appropriate messages should be displayed for the input of invalid item name, then program should proceed to process next operation

Expected output:

>: 2
Enter the item name to search: table
table not found.

>: 2
Enter the item name to search: Microwave
Microwave is in stock.

For operation #3 (ordering), program should validate the input number of order and make sure there are enough items in the inventory. Otherwise, display error message and skip the ordering –

Expected output:

>: 3
Enter the name of the item: Microwave
Enter the nuber of items: 100
Insufficient inventory.

>: 3
Enter the name of the item: Microwave
Enter the nuber of items: 2
Total cost is $300

>: 3
Enter the name of the item: table
table not found.

but when I try to search for the name of the item by name using binary search, it doesn't give me the result I want, example:

>: 2
Enter the item name to search: Cooking Range
Cooking Range not found.

>: 2
Enter the item name to search: Circular Saw
Circular Saw not found.

This is the file that contains the data:

itemData.txt

1111
Dish Washer
20 550.5
2222
Microwave
75 150
3333
Cooking Range 
50 850
4444
Circular Saw
150 125

And this is the definition of the function I tried to implement to search the items by name:

int
searchItemByName(vector<Item> items, string searchName)
{
    int low, high, mid;

    low = 0;
    high = items.size() - 1;
    while (low <= high) {
        mid = (low   high) / 2;

        if (items[mid].getName() == searchName)
            return (mid);
        else if (items[mid].getName() > searchName)
            high = mid - 1;
        else
            low = mid   1;
    }
    return (-1);
}

Here is the entire program (I've also added a clearer and broader "description" of what the program should do with some tests.):

https://github.com/jrchavez07/project_07

CodePudding user response：

I checked your GitHub project.

I think you have to sort data before binary search.

Current Data in the sample text file list like this:

Dish Washer
Microwave
Cooking Range 
Circular Saw

And these are not sorted, so you can not use Binary Search.