Concept explainers
(Count positive and negative numbers and compute the average of numbers) Write a
Enter an integer, the input ends if it is 0: 1 2 -1 3 0
The number of positives is 3
The number of negatives is 1
The total is 5.0
The average is 1.25
Enter an integer, the input ends if it is 0: 0
No numbers are entered except 0
Count positive and negative numbers and compute the average of numbers
Program Plan:
- Include the required import statement.
- Define the class
- Define the main() method using public static main.
- Declare and initialize the required variables.
- Declare the input scanner.
- Read an input from the user.
- Using while loop, check whether the integer is “0” or not
- Check whether the integer is greater than “0”.
- If so, increment the positive counter.
- Check whether the integer is less than “0”.
- If so, increment the negative counter.
- Calculate the sum of integers.
- Read the next input.
- Check whether the integer is greater than “0”.
- Display the sum and average of integers.
- Define the main() method using public static main.
The below program is used to count number of positives and number of negatives which are presented as inputs and finally calculate its sum and average as follows:
Explanation of Solution
Program:
//import statement
import java.util.Scanner;
//class Excersise_1
public class Excersise_1 {
// main function
public static void main(String[] args) {
// declare and initialize the required variables
int count_Positive = 0, count_Negative = 0;
int counter = 0, sum = 0, integer;
// declare the input scanner
Scanner in = new Scanner(System.in);
// print the instruction
System.out.print("Enter an integer, the input ends if it is 0: ");
// read the integer value from user
integer = in.nextInt();
// using while loop, check the integer
while (integer != 0) {
// check if it is positive
if (integer > 0)
/* if so, increment the positive counter */
count_Positive++;
// check if it is negative
else if (integer < 0)
/* if so, increment the negative counter */
count_Negative++;
// calculate the total of integer
sum += integer;
// increment the counter
counter++;
// Read the next integer
integer = in.nextInt();
}
// check the counter is 0
if (counter == 0)
// if so, no inputs are read
System.out.println("No numbers are entered except 0");
else {
// print the number of positive integers
System.out.println("The number of positives is " + count_Positive);
// print the number of negative integers
System.out.println("The number of negatives is " + count_Negative);
// print the sum
System.out.println("The total is " + sum);
// print the overall average
System.out.println("The average is " + sum * 1.0 / counter);
}
}
}
Enter an integer, the input ends if it is 0: 1
2
-1
3
0
The number of positives is 3
The number of negatives is 1
The total is 5
The average is 1.25
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