Java > AP-1 > scoreUp (CodingBat Solution)

Problem:

The "key" array is an array containing the correct answers to an exam, like {"a", "a", "b", "b"}. the "answers" array contains a student's answers, with "?" representing a question left blank. The two arrays are not empty and are the same length. Return the score for this array of answers, giving +4 for each correct answer, -1 for each incorrect answer, and +0 for each blank answer.

scoreUp({"a", "a", "b", "b"}, {"a", "c", "b", "c"}) → 6
scoreUp({"a", "a", "b", "b"}, {"a", "a", "b", "c"}) → 11
scoreUp({"a", "a", "b", "b"}, {"a", "a", "b", "b"}) → 16


Solution:

public int scoreUp(String[] key, String[] answers) {
  int score = 0;
  for (int i = 0; i < key.length; i++) {
    if (key[i] == answers[i])
      score += 4;
    else if (answers[i] != "?" && answers[i] != key[i])
      score--;
  }
  return score;
}


5 comments :

  1. public int scoreUp(String[] key, String[] answers) {

    int score = 0;

    for( int x = 0; x < key.length; x++){
    if (answers[x].equals(key[x])) score +=4;
    else
    if (!answers[x].equals("?")) score -=1;
    }

    return score;
    }

    ReplyDelete
  2. public int scoreUp(String[] key, String[] answers) {

    int res = 0;

    for (int i = 0; i < key.length; i++) {
    if (answers[i] != "?") {
    if (key[i].equals(answers[i])) {
    res += 4;
    } else {
    res--;
    }
    }
    }

    return res;
    }

    ReplyDelete
  3. public int scoreUp(String[] key, String[] answers) {
    int sum=0;
    for (int i = 0; i < answers.length; i++) {
    if(answers[i].charAt(0)!='?'){
    if(key[i].charAt(0)==answers[i].charAt(0)){
    sum+=4;
    }
    else sum-=1;
    }
    }

    return sum;
    }

    ReplyDelete
  4. Solution Using ternary operator:

    public int scoreUp(String[] key, String[] answers) {

    int score = 0;

    for(int i=0; i<answers.length; i++){

    String tmp1 = key[i];
    String tmp2 = answers[i];


    //Using ternary operator for the solution
    score = tmp2=="?" ? (score+0) : tmp1.equals(tmp2) ? (score+4) : (!(tmp1.equals(tmp2))) ? (score-1) : score;

    }
    return score;
    }

    ReplyDelete
  5. public int scoreUp(String[] key, String[] answers) {

    int count=0;
    for(int i=0;i<key.length;i++){

    if(answers[i]=="?"){
    count=count+0;
    }
    else if(key[i]==answers[i]){
    count=count+4;
    }
    else {
    count=count-1;
    }

    }
    return count;
    }

    ReplyDelete

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