Java > Warmup-2 > altPairs (CodingBat Solution)

Problem:

Given a string, return a string made of the chars at indexes 0,1, 4,5, 8,9 ... so "kittens" yields "kien".

altPairs("kitten") → "kien"
altPairs("Chocolate") → "Chole"
altPairs("CodingHorror") → "Congrr"


Solution:

public String altPairs(String str) {
  String result = "";
  
  for (int i=0; i<str.length(); i += 4) {
    int end = i + 2;
    if (end > str.length()) {
      end = str.length();
    }
    result = result + str.substring(i, end);
  }
  
  return result;
}

5 comments:

  1. UnknownAugust 4, 2017 at 11:40 AM

    public String altPairs(String str) {

    String ans="";

    for (int i =0; i<str.length();i++){
    ans += str.charAt(i);
    if(i%2!=0) i+=2;
    }

    return ans;
    }

    ReplyDelete
  2. Studious StudentSeptember 13, 2019 at 4:01 PM

    public String altPairs(String str) {
    String s1="";
    for(int i=0; i<str.length();i++){
    if(i%2==0) s1=s1+str.charAt(i);
    if(i%2!=0){
    s1=s1+str.charAt(i);
    i=i+2;
    }
    }
    return s1;
    }

    ReplyDelete
  3. Vinod VBMarch 17, 2020 at 10:27 AM

    public String altPairs(String str) {
    String s="";
    int i=0;
    while(i<str.length())
    {
    s=s+str.charAt(i);
    i++;
    if(i<str.length())
    {
    s=s+str.charAt(i);
    i=i+3;
    }
    }
    return s;
    }

    ReplyDelete
  4. UnknownJanuary 10, 2022 at 8:39 AM

    public String altPairs(String str) {
    String word = "";

    for(int i = 0; i < str.length(); i++){
    if(i % 4 == 0 || i % 4 == 1) word+= str.charAt(i);
    }
    return word;
    }

    ReplyDelete
  5. MaheshFebruary 2, 2022 at 12:46 PM

    public String altPairs(String str) {
    int count=0;
    String str1="";
    for(int i=0; i<str.length(); i++){
    count++;
    if(count == 3){
    continue;
    }
    else if(count == 4 ){
    count = 0;
    }
    else{
    str1+=str.charAt(i);
    }
    }
    return str1;
    }

    ReplyDelete