CODEWITHSUNDEEP
c++vector
Mdjon26
Mdjon26

Reputation: 2255

Adding to vectors correctly

I'm creating a program that puts prime numbers into a vector. I'll give an example to better demonstrate how this program should work:

User: 3

Output 3

User: 13

Ouput: 3 5 7 11 13

To put it in words, this program is adding up the prime numbers less than or equal to the input of the user. Then finally giving a bool of true or false if the actual input of the user was a prime number.

            if (found)
            {
                vector_output.push_back(j);

            }
            if (number == j)
            {
                if (found ==false)
                    return false;
                else




void checkprime::vector_finder()    
{
    for (int k=0; k < vector_output.size(); k ++)
    {    
        cout << vector_output[k];
    }    
}

Unfortunately, my output is:

User 3

Output 3

User 13

Output: 3 5 5 5 7 7 7 7 7 9 11 13

How can I get it to where the vector does not duplicate numbers?

I thought something like an if statement right before the vector_output.pushback(j) such as

if (vector_output.size() != 0 && vector.output.back() != j)
      vector_output.push_back(j);

would work, but it's not outputting anything with this.

Upvotes: 1

Views: 111

Answers (1)

David G
David G

Reputation: 96790

You can remove the duplicates using std::unique. For example:

std::vector<int> v{1, 2, 2, 3, 5, 9, 1};
std::sort(v.begin(), v.end());

v.erase(std::unique(v.begin(), v.end()), v.end());

Upvotes: 1

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