Question

It's java file

1. declare an vector without specifying the size

2. use push_back to add random integers between 100 and 999 to the vector

3. write a function that returns the smallest, largest, and average of the numbers in the vector

3. display the smallest, largest, and average of the numbers in the vector

Answer 1

Hi, please fallow the important steps for solution of your code.

1. In this we used Math.random() function is used to generate the random numbers based on given minimum and max value.

this function needs to convert to int because by default it was double. So that's reason we used to cast int

2. In vector we can get the element based on the index. Index will start from 0 (Zero)

getIndex(0) will return first value

3. size() nethod returns the total number of elements or size of the vactor.

4. function will return only one value

Please find the code and screen shot of the code along with comments

Java file

-----------------------------

import java.util.Vector;

public class Vector_Random {

    public static void main(String[] args) {

        // vector with out size
        Vector<Integer> userVector = new Vector<>();

        // this line will generate random number between 1 to 5. you may chnage
        int randomNumber = (int) (1 + (Math.random() * 5) );

        // used push_back it will add a random number between 100 and 999 in vector object
        for (int i = 0; i < randomNumber; i++) {

            userVector.add((int) ( 100 + (Math.random() * 999) ));
        }

        //printing vector on the console
        System.out.println(userVector);

        // this function will return average of vector
        System.out.println("Average is : " + getAverageFromVector(userVector));
    }

    private static double getAverageFromVector(Vector<Integer> userVector) {

        // initially we declared avg and total is 0
        double avg =0,total=0;

        // assign first value from the vector to smallest and greatest
        int smallest=userVector.get(0), greatest =userVector.get(0);

        for (int i = 0; i < userVector.size(); i++) {

            // every value will be added to the total
            total+=userVector.get(i);

            // this is the logic and check each value with smallest and highest and store the value based on condition
            if(userVector.get(i) < smallest) {
                smallest = userVector.get(i);
            }

            if(userVector.get(i) > greatest) {
                greatest = userVector.get(i);
            }
        }

        // printing details
        System.out.println("Smallest is : " +smallest);
        System.out.println("greatest is : " +greatest);

        // calculate the avg
        avg = total / userVector.size();

        // return the avg
        return  avg;
    }
}

Snippet code:

import java.util.Vector;

public class Vector_Random {

    public static void main(String[] args) {

        // vector with out size
        Vector<Integer> userVector = new Vector<>();

        // this line will generate random number between 1 to 5. you may chnage
        int randomNumber = (int) (1 + (Math.random() * 5) );

        // used push_back it will add a random number between 100 and 999 in vector object
        for (int i = 0; i < randomNumber; i++) {

            userVector.add((int) ( 100 + (Math.random() * 999) ));
        }

        //printing vector on the console
        System.out.println(userVector);

        // this function will return average of vector
        System.out.println("Average is : " + getAverageFromVector(userVector));
    }

    private static double getAverageFromVector(Vector<Integer> userVector) {

        // initially we declared avg and total is 0
        double avg =0,total=0;

        // assign first value from the vector to smallest and greatest
        int smallest=userVector.get(0), greatest =userVector.get(0);

        for (int i = 0; i < userVector.size(); i++) {

            // every value will be added to the total
            total+=userVector.get(i);

            // this is the logic and check each value with smallest and highest and store the value based on condition
            if(userVector.get(i) < smallest) {
                smallest = userVector.get(i);
            }

            if(userVector.get(i) > greatest) {
                greatest = userVector.get(i);
            }
        }

        // printing details
        System.out.println("Smallest is : " +smallest);
        System.out.println("greatest is : " +greatest);

        // calculate the avg
        avg = total / userVector.size();

        // return the avg
        return  avg;
    }
}

Sample Output:

All the best..