JAVA: Finding Values in an Array

Question

Set numMatches to the number of elements in userValues (having NUM_VALS elements) that equal matchValue. Ex: If matchValue = 2 and userValues = {2, 2, 1, 2}, then numMatches = 3.

import java.util.Scanner;

public class FindMatchValue {
public static void main (String [] args) {
   final int NUM_VALS = 4;
   int[] userValues = new int[NUM_VALS];
   int i = 0;
   int matchValue = 0;
   int numMatches = -99; // Assign numMatches with 0 before your for loop

  userValues[0] = 2;
  userValues[1] = 2;
  userValues[2] = 1;
  userValues[3] = 2;

  matchValue = 2;

  **/* Your solution goes here  */**

  numMatches = 0;

 for(i = 0; i < NUM_VALS; ++i) {
    if(userValues[i] == matchValue)
       numMatches = i;
 }        
  System.out.println("matchValue: " + matchValue + ", numMatches: " +     numMatches);

  return;
  }
}

My solution has mistakes that I can't figure out.

Testing matchValue = 0,

userValues = {0, 0, 0, 0, 0}

Expected value: 5

Your value: 4 <<< This is where I'm going wrong.

and your question are... ?

Rudy
– Rudy

2016-09-29 03:58:25 +00:00
Commented Sep 29, 2016 at 3:58 — Rudy
– Rudy, Commented Sep 29, 2016 at 3:58

Himanshu Bhardwaj · Accepted Answer · 2016-09-29 04:00:30Z

3

for(i = 0; i < NUM_VALS; ++i) {
   if(userValues[i] == matchValue) {
      //numMatches = i;   //WRONG
      numMatches++;     //Correct
   }
}

This block is incorrect, you are assigning numMatches to the index value of the array rather, it should have been that if there's a match increment values of numMatches by 1.

answered Sep 29, 2016 at 4:00

Himanshu Bhardwaj

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Comments

Ajay Pal · Accepted Answer · 2016-09-29 04:02:34Z

1

numMatches++ this is what you need to do in the for loop instead of numMatches = i;

answered Sep 29, 2016 at 4:02

Ajay Pal

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Comments

Bernard Kiprotich · Accepted Answer · 2020-12-11 19:29:49Z

1

   numMatches = 0; //initialize numMatches to 0
   for (i = 0; i < userValues.length; ++i) {
     if(userValues[i] == matchValue){
        matchValue = userValues[i]; //reassign numValue to the current array value
         numMatches +=1;//increment numValue by 1
        }
  }

edited Dec 11, 2020 at 19:29

answered Dec 9, 2020 at 6:41

Bernard Kiprotich

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