Can someone help me with "struct"?

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My professor requires us to do:

Write and run a program that builds a struct called "part_rec". Each "part_rec" struct will be a record in a database (struct array) called Robot_parts[ ].
Each "part_rec" struct is composed of an integer called "part_num", a string called "part_name", an integer called "part_quantity" and a double called
"part_cost". A function called void display() takes the entire Robot_parts[ ] array in by pointer and displays this information in the function.
Make sure to display this information with good column headings and alignment in the function.

In main(), initialize Robot_parts[ ] as:
part_rec Robot_parts[ ] = {{ 7789, "QTI", 4, 12.95},
{1654, "bolt", 4, 0.34},
{6931, "nut", 4, 0.25}};
Once initialized in main(), call the display() function and pass a pointer address to Robot_parts[ ] as its argument.

As I compile&run the program, there are no results

C++

#include <iostream>
#include <string>
#include<iomanip>

using namespace std;
 
void display();

struct part_rec
{
   	int part_num;
  	string part_name;
  	int part_quantity;
  	double part_cost;
};

int main()
{
	char ch;
	
	 
    part_rec Robot_parts[ ] = {
                              {7789, "QTI", 4, 12.95},
                              {1654, "bolt", 4, 0.34},
                              {6931, "nut", 4, 0.25} 
                                                    };
                                                
    cout<<" enter 'e' to exit";
    cin>>ch;
    
    
    return 0;
}

void display(part_rec *Robot_parts[])
{
     int i; 
     
     for(i = 0; i<3; i++)
           cout<<setw(5)<<Robot_parts[i]->part_num;
           cout<<setw(7)<<Robot_parts[i]->part_name;
           cout<<setw(5)<<Robot_parts[i]->part_quantity;
           cout<<setw(10)<<Robot_parts[i]->part_cost;
           
    return;
}

What I have tried:

N/A

Posted 17-Apr-16 12:07pm

Member 12466410

Updated 17-Apr-16 13:49pm

Garth J Lancaster

v2

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Comments

Mohibur Rashid 17-Apr-16 18:20pm

Describe your error message

Member 12466410 17-Apr-16 18:23pm

I got no error message. The program worked but it did not display anything

Mohibur Rashid 17-Apr-16 18:27pm

What is the exact message?

Member 12466410 17-Apr-16 18:34pm

it displays " enter'e' to exit"
and that's it

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Garth J Lancaster · Answer 1 · 2016-04-17T13:04:00

thats because you dont actually call your display/output routine. Perhaps you should change this

part_rec Robot_parts[ ] = {
{7789, "QTI", 4, 12.95},
{1654, "bolt", 4, 0.34},
{6931, "nut", 4, 0.25} 
};

cout<<" enter 'e' to exit";
cin>>ch;

to

part_rec Robot_parts[ ] = {
{7789, "QTI", 4, 12.95},
{1654, "bolt", 4, 0.34},
{6931, "nut", 4, 0.25} 
};

display(Robot_parts);

cout<<" enter 'e' to exit";
cin>>ch;

[edit]

this :-

void display(part_rec *Robot_parts[])
{
     int i; 
     
     for(i = 0; i<3; i++)
           cout<<setw(5)<<Robot_parts[i]->part_num;
           cout<<setw(7)<<Robot_parts[i]->part_name;
           cout<<setw(5)<<Robot_parts[i]->part_quantity;
           cout<<setw(10)<<Robot_parts[i]->part_cost;
           
    return;
}

would be 'nicer' / ? more correct as

void display(part_rec *Robot_parts[])
{    
     for(int i = 0; i<3; i++)
     {
           cout<<setw(5)<<Robot_parts[i]->part_num;
           cout<<setw(7)<<Robot_parts[i]->part_name;
           cout<<setw(5)<<Robot_parts[i]->part_quantity;
           cout<<setw(10)<<Robot_parts[i]->part_cost;
     }     
    return;
}

and instead of hardcoding 3 as the number of elements in the array, you could probably (to make your program future safe)

C++

int numberOfParts = sizeof(Robot_parts) / sizeof(Robot_parts[0]);

and then use that like

C++

for(int i = 0; i<numberOfParts; i++)

or pass the number of elements in the array into the display(...) function

[/edit]

[edit 2 - warning bells in my head]

doing this

int numberOfParts = sizeof(Robot_parts) / sizeof(Robot_parts[0]);

is fine, but, I dont think it can be done from within display(...) so, that means you do something like this

int numberOfParts = sizeof(Robot_parts) / sizeof(Robot_parts[0]);
display(Robot_parts, numberOfParts);

and change the declaration of display() to

void display(part_rec *Robot_parts[], int numberOfParts)

[/edit2]