Question

Can someone explain me parts of this code I do not fully understand what its doing or what its purpose is. I have highlighted the parts I'm confused over. Please explain thoroughly.

import java.util.Scanner;

class A1Stats {
public static void main(String args[]) {
double min, max, sum, mean;
int n;

Scanner scanner = new Scanner(System.in);

String input = scanner.nextLine();
String[] numbers = input.split(" ");
double value[] = new double[numbers.length];

if(numbers.length > 0){
for (int i = 0; i < numbers.length; i++) {
   value[i] = Double.parseDouble(numbers[i]);
}
max = value[0];
min = value[0];
sum = value[0];
n = numbers.length;

for (int i = 1; i < value.length; i++) {
   if (max < value[i]) {
    max = value[i];
   }
   if (min > value[i]) {
    min = value[i];
   }
   sum = sum + value[i];
}

mean = sum/value.length;

System.out.println("min = " + min);
System.out.println("max = " + max);
System.out.println("sum = " + sum);
System.out.println("n = " + n);
System.out.println("mean = " + mean);

}

else{
System.out.println("There was no input data.");
}
}

}

Answer 1

Here is code in comments :

import java.util.Scanner;

class A1Stats {

public static void main(String args[]) {

double min, max, sum, mean;

int n;

Scanner scanner = new Scanner(System.in);

// reads line of numbers splited by spaces

String input = scanner.nextLine();

String[] numbers = input.split(" "); // split the line by space

double value[] = new double[numbers.length]; // creating new array of double array

// check if number are present

if (numbers.length > 0) {

// conveting the number enter to double values

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

value[i] = Double.parseDouble(numbers[i]);

}

// setting up initial value to max, min, sum

max = value[0];

min = value[0];

sum = value[0];

n = numbers.length;

// loop each value and find min, max, sum

for (int i = 1; i < value.length; i++) {

if (max < value[i]) {

max = value[i];

}

if (min > value[i]) {

min = value[i];

}

sum = sum + value[i];

}

// calculating the average

mean = sum / value.length;

// displaying the output

System.out.println("min = " + min);

System.out.println("max = " + max);

System.out.println("sum = " + sum);

System.out.println("n = " + n);

System.out.println("mean = " + mean);

}

else {

System.out.println("There was no input data.");

}

}

}

Output: