Finding max, min, sum, and average of n amount of values using for loop

Question

Use the for loop to write a program to prompt the user to enter twelve n amount of numbers and then display the minimum, maximum, sum and the average of these numbers.

I don't can't puzzle how I would use a for loop in order to this, I've been having a bit of trouble.

import java.util.Scanner;

public class Loop{

    public static void main(String[] args) {


        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter number 1: ");
        double a = scanner.nextDouble();

        System.out.println("Enter number 2: ");
        double b = scanner.nextDouble();

        System.out.println("Enter number 3: ");
        double c = scanner.nextDouble();

        System.out.println("Enter number 4: ");
        double d = scanner.nextDouble();

        System.out.println("Enter number 5: ");
        double e = scanner.nextDouble();    

        System.out.println("Enter number 6: ");
        double f = scanner.nextDouble();    

        System.out.println("Enter number 7: ");
        double g = scanner.nextDouble();    

        System.out.println("Enter number 8: ");
        double h = scanner.nextDouble();    

        System.out.println("Enter number 9: ");
        double i = scanner.nextDouble();

        System.out.println("Enter number 10: ");
        double j = scanner.nextDouble();    

        System.out.println("Enter number 11: ");
        double k = scanner.nextDouble();    

        System.out.println("Enter number 12: ");
        double l = scanner.nextDouble();    

        double minNum = Math.min(a, Math.min(b, Math.min(c, Math.min(d, Math.min(e, Math.min(f, Math.min(g, Math.min(h, Math.min(i , Math.min(j, Math.min(k, l)))))))))));
        double maxNum = Math.max(a, Math.max(b, Math.max(c, Math.max(d, Math.max(e, Math.max(f, Math.max(g, Math.max(h, Math.max(i , Math.max(j, Math.max(k, l)))))))))));
        double sumNum = (a + b + c + d + e + f + g + h + i + j + k + l);

        for(int i = 0; )


    }

}

I expected the output to be used with the for loop, but then again I do not understand how I would use it in this method.

Answer 1

Here is a nicer way to do this, which doesn't even require storing all the numbers at once. The approach here is to keep a running tab on the largest and smallest input, as each new number is input. Also, we maintain a running total of all numbers entered, which later easily can be used to compute the average.

Scanner scanner = new Scanner(System.in);
double max, min, avg;
double total = 0.0d;
boolean first = true;
int numbers = 12;

for (int i=0; i < numbers; ++i) {
    System.out.println("Enter number:");
    double d = scanner.nextDouble();

    if (first) {
        max = d;
        min = d;
        total = d;
        first = false;
    }
    else {
        if (d > max) {
            max = d;
        }
        else if (d < min) {
            min = d;
        }
        total += d;
    }
}

avg = total / numbers;
System.out.println("max: " + max + ", min: " + min + ", avg: " + avg);

Note that a more advanced approach might be to do something like store all 12 numbers into a list, and then leverage the Java 8 stream API to find the max, min, and average. But I suspect that is not the answer you want for your question.

Answer 2

Place this java code in the main function

`Scanner s=new Scanner(System.in);
int t=s.nextInt(); //12
int sum=0;
int min=Integer.MIN_VALUE;
int max=Integer.MAX_VALUE;
for(int i=0;i<t;i++){
int temp=s.nextInt();
if(temp<min)
 min=temp;
if(temp>max)
 max=temp;
sum+=temp;
}
System.out.println(min +" "+max+" "+sum);`

Answer 3

You can do this.

Scanner scanner = new Scanner(System.in);
double max = Double.MAX_VALUE, min = Double.MIN_VALUE, total = 0.00d;
int n = 12; // Change this to the number of values needed
for (int i=0; i < n; i++) {
    System.out.println("Enter number:");
    double d = scanner.nextDouble();

    if (d > max) {
        max = d;
    }
    else if (d < min) {
        min = d;
    }
    total += d;
}

Double avg = total / n;
System.out.println("max: " + max + ", min: " + min + ", avg: " + avg);