Compare two static arrays - c++

Question

I have an issue how to implement to compare two static arrays, ie.
string bufferNames[]={"apple","orange","banana","pomegranate","pear"};
string bufferPictures[] = {"apple.bmp","orange.bmp","banana.bmp","pomegranate.bmp","pear.bmp"};
Each item in the bufferNames presents the choice that to someone has been given, when the picture from the bufferPictures has been loaded onto the screen. So, if I for example get orange.bmp using rand() function that iterates through that list, how can I get the same one corresponding element orange and two other random not correct elements. Any help would be appreciated.
Thanks in advance.
P.S. If further breaking in of the problem is needed, just say it so.

Answer 1

This should do it. The code makes use of the C++11 features. You will
need to adapt it, to pass it off as homework.
#include <string>
#include <iostream>
#include <algorithm>
#include <vector>
struct Picture {
std::string name, file;
bool operator==(const Picture& x) const { return this->name == x.name && this->file == x.file; }
bool operator!=(const Picture& x) const { return !(*this == x); }
};
int main()
{
std::vector< Picture > pics =
{
{"apple", "apple.bmp"},
{"orange", "orange.bmp"},
{"banana", "banana.bmp"},
{"pear", "pear.bmp"},
};
// determined by random choice
const Picture& choice = pics[0];
std::vector< Picture > woChoice;
std::copy_if(pics.begin(), pics.end(), std::back_inserter(woChoice),
[&choice](const Picture& x) {
return x != choice;
});
// random shuffle the remainder and pick the first
// two. alternatively and for more efficience use std::random to
// generate indices
std::random_shuffle(woChoice.begin(), woChoice.end());
std::cout << woChoice[0].name << std::endl;
std::cout << woChoice[1].name << std::endl;
return 0;
}

Answer 2

So, if I for example get orange.bmp using rand() function that iterates through that list, how can I get the same one corresponding element orange and two other random not correct elements.
If you use rand() to get a number (let's call it x) between 0 and 4 inclusive (based on there being 5 distinct values in the arrays), then you can use that number in both arrays to find the related word and image.
To get one other random incorrect element, you can call rand() in a loop until you get a value other than x. Let's call it y.
To get another random incorrect elements, you can call rand() in a loop until you get a value other than x and y.
There are other ways to do this, but that's probably easiest to understand and implement.

Answer 3

The names in arrays correspond to each other. So, if you need fruit
number i, take bufferNames[i] and bufferPictures[i] in parallel way.
Ensure that names ARE parallel. Simply making the second array
elements from the first array elements.
As for random in range 0..n-1 excluding elements number i,j (j>i), count it so:
temp=random(n-3);
k=(temp>=i?temp+1:temp);
k=(k>=j?k+1:k);
And again, take bufferNames[k] and bufferPictures[k].
It is not simple, it is VERY simple.