scriptjs

const numQuestions = document.querySelectorAll(".questionContainer").length;
let correctAnswers = 0;

document.getElementById("check").addEventListener("click", function(){
  correctAnswers = 0;
  for (let i = 1; i <=numQuestions;i++){
    document.querySelector("#question" + i).classList.remove("incorrect");
    document.querySelector("#question" + i).classList.remove("correct");
  }

  for (let i = 1; i <= numQuestions; i++){
    for (let j = 1; j <= 3; j++) {
      if (document.getElementById("q" + i + "-ans" + j).checked && document.getElementById("q" + i + "-ans" + j).classList.contains("correct")){
        correctAnswers++;
        document.querySelector("#question" + i).classList.remove("incorrect");
        document.querySelector("#question" + i).classList.add("correct");
        break;
      }
      else {
        document.querySelector("#question" + i).classList.add("incorrect");
      }
    }
  }

  document.getElementById("result").textContent = "Correct answers " + correctAnswers + "/" + numQuestions;
})