CODEWITHSUNDEEP
c++
zain momin
zain momin

Reputation: 11

Unique id in c++

So the question is to store id of 11 students and store their runs in a cricket match the runs must be greater then 10 and the id number of students must be unique i am only facing problem in creating a condition that when a user inputs same value the programm should tell that the value exists already and add a different value.l

#include <iostream>

using namespace std;

void main() {
  int id[5];
  int run[5];
  int a, b, c, d, e, f;
  for (int i = 0; i < 5; i++) {
    for (int j = i; j < 5; j++) {
      cout << "Enter id" << i << endl;
      cin >> id[i];
      if (id[i] == id[j]) {
        cout << "same id exists";
        cin >> id[i];
      }

      cout << "Enter runs of student \n";
      do {
        cout << "Runs must be greater or equal to 10 \n";
        cin >> run[i];
      } while (run[i] < 10);
    }
  }

  system("pause");

Upvotes: 0

Views: 216

Answers (1)

Paul Evans
Paul Evans

Reputation: 27577

You want to store the ids in a std::set (or std::unordered_set):

#include <unordered_set>

std::unordered_set<id_type> ids;
// . . .
if (auto [iter, is_inserted] = ids.insert(new_id); !is_inserted) {
    // take care of repeated id
}

And as 463035818-is-not-a-number points out if you need a student associated with each id use a std::map (or std::unordered_map):

#include <unordered_map>

std::unordered_map<id_type, stdent_type> students;
// . . . 
if (auto [iter, is_inserted] = students.emplace(new_id, new_student); !is_inserted) {
    // take care of repeated id 
}

Upvotes: 2

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