Question

Find the maximum value and minimum value in milesTracker. Assign the maximum value to maxMiles, and the minimum value to minMiles. Sample output for the given program:

Min miles: -10
Max miles: 40

import java.util.Scanner;

public class ArraysKeyValue {
public static void main (String [] args) {
Scanner scnr = new Scanner(System.in);
final int NUM_ROWS = 2;
final int NUM_COLS = 2;
int [][] milesTracker = new int[NUM_ROWS][NUM_COLS];
int i;
int j;
int maxMiles; // Assign with first element in milesTracker before loop
int minMiles; // Assign with first element in milesTracker before loop

for (i = 0; i < milesTracker.length; i++){
for (j = 0; j < milesTracker[i].length; j++){
milesTracker[i][j] = scnr.nextInt();
}
}

/* your solution goes here*/
  
minMiles = milesTracker[0][0];
maxMiles = milesTracker[0][0];
for (i=0; i<NUM_ROWS; ++i) {
for(j=0; j< NUM_COLS; ++j) {
if (milesTracker[i][j]> maxMiles)
maxMiles= milesTracker[i][j];
if (milesTracker[i][j]< minMiles)
minMiles= milesTracker[i][i];
}
}
/* Your solution goes here */

System.out.println("Min miles: " + minMiles);
System.out.println("Max miles: " + maxMiles);
}
}

when using the inputs -10 20 30 40 the code works fine, but when its run with different inputs the code can't seem the recognize the Min Miles (ie, 73 0 50 12, the code is suggesting 12 is the minimum output

Answer 1

import java.util.Scanner;

public class ArraysKeyValue {
    public static void main(String[] args) {
        Scanner scnr = new Scanner(System.in);
        final int NUM_ROWS = 2;
        final int NUM_COLS = 2;
        int[][] milesTracker = new int[NUM_ROWS][NUM_COLS];
        int i;
        int j;
        int maxMiles; // Assign with first element in milesTracker before loop
        int minMiles; // Assign with first element in milesTracker before loop

        for (i = 0; i < milesTracker.length; i++) {
            for (j = 0; j < milesTracker[i].length; j++) {
                milesTracker[i][j] = scnr.nextInt();
            }
        }

        minMiles = milesTracker[0][0];
        maxMiles = milesTracker[0][0];
        for (i = 0; i < NUM_ROWS; ++i) {
            for (j = 0; j < NUM_COLS; ++j) {
                if (milesTracker[i][j] > maxMiles) maxMiles = milesTracker[i][j];
                if (milesTracker[i][j] < minMiles) minMiles = milesTracker[i][j];
            }
        }

        System.out.println("Min miles: " + minMiles);
        System.out.println("Max miles: " + maxMiles);
    }
}