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C++ Exercises: Find and print all unique elements of a given array of integers

C++ Array: Exercise-26 with Solution

Write a C++ program to find and print all unique elements of a given array of integers.

Pictorial Presentation:

C++ Exercises: Find and print all unique elements of a given array of integers

Sample Solution:

C++ Code :

#include <iostream>
using namespace std;


int main()
{
    int array1[] = {1, 5, 7, 5, 8, 9, 11, 11, 2, 5, 6};
    int s1 = sizeof(array1)/sizeof(array1[0]);

    cout << "Original array: ";
    
    for (int i=0; i < s1; i++) 
    cout << array1[i] <<" ";
    
    cout <<"\nUnique elements of the said array: ";
    for (int i=0; i<s1; i++)
    {
        int j;
        for (j=0; j<i; j++)
           if (array1[i] == array1[j])
               break;
         if (i == j)
          cout << array1[i] << " ";
    }
    return 0; 
}

Sample Output:

Original array: 1 5 7 5 8 9 11 11 2 5 6 
Unique elements of the said array: 1 5 7 8 9 11 2 6 

Flowchart:

Flowchart: Find and print all unique elements of a given array of integers

C++ Code Editor:

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Previous: Write a C++ program to find and print all common elements in three sorted arrays of integers.
Next: Write a C++ program to find the number of pairs of integers in a given array of integers whose sum is equal to a specified number.

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C++ Programming: Tips of the Day

Can I assume (bool)true == (int)1 for any C++ compiler?

According to the standard, you should be safe with that assumption. The C++ bool type has two values - true and false with corresponding values 1 and 0.

The thing to watch about for is mixing bool expressions and variables with BOOL expression and variables. The latter is defined as FALSE = 0 and TRUE != FALSE, which quite often in practice means that any value different from 0 is considered TRUE.

A lot of modern compilers will actually issue a warning for any code that implicitly tries to cast from BOOL to bool if the BOOL value is different than 0 or 1

Ref: https://bit.ly/3PWhs5N