I am trying to display the multiples of a user-inputted number given 6 user-inputted numbers. I think I am sort of close, but I am stuck.

For example, if someone enters "4" and then their 6-number sequence is "23 45 12 16 51 8", it should return 12 16 8 because those are the multiples of the first inputted "4".

So far I have the following:

#include <iostream>
using namespace std;


//Display multiples of a number that appear within a sequence of numbers.

//E.g. input is looking for multiples of 5 in the following sequence of 6 numbers: 6 10 9 3 25 79 → output: 10 25

int main() {
  int userNum;
  int seq1, seq2, seq3, seq4, seq5, seq6;

  cout << "Enter a number: " << userNum;
  cin >> userNum;

  cout << "Enter a sequence of 6 numbers: " << seq1 << " " << seq2 << " " << seq3 << " " << seq4 << " " << seq5 << " " << seq6;
  
  cin >> seq1;
  cin >> seq2;
  cin >> seq3;
  cin >> seq4;
  cin >> seq5;
  cin >> seq6;

  int sequence[] = {seq1, seq2, seq3, seq4, seq5, seq6};

  int total;

  for (int sequence[] = seq1; i < 6; i  ) {

    if (i % userNum == 0) {
      return total;

    }


  }
  cout << "Multiples in the sequence are: " << total;

}

CodePudding user response：

• You print userNum and seq1 to seq6 before you've assigned values to them. That makes the program have undefined behavior.
• Your for loop has invalid syntax and you also return instead of printing the matching values. A fix could look like this:

  for (int i = 0; i < 6; i  ) {
      if (sequence[i] % userNum == 0) {
          std::cout << sequence[i] << ' ';
      }
  }
  

• You don't actually need the variables seq1 to seq6. Just input directly into sequence. You can also use range-based for loops to make looping over the elements in sequence easier.

Example:

#include <array>     // std::size
#include <iostream>

int main() {
    int userNum;
    std::cout << "Enter a number: ";
    std::cin >> userNum;

    int sequence[6];
    std::cout << "Enter a sequence of " << std::size(sequence) << " numbers: ";

    for(int& num : sequence) { // a range-based for loop
        std::cin >> num;       // assign to all 6 elements in a loop
    }

    std::cout << "Multiples in the sequence are: ";
    for(int num : sequence) { // another range-based for loop
        if(num % userNum == 0) {
            std::cout << num << ' ';
        }
    }
    std::cout << '\n';
}