Java: Sum of all numerical values embedded in a sentence

Last update on May 13 2025 12:58:51 (UTC/GMT +8 hours)

Sum of Numerical Values in a Sentence

Write a Java program to sum all numerical values (positive integers) embedded in a sentence.

Input:
Sentences with positive integers are given over multiple lines. Each line is a character string containing one-byte alphanumeric characters, symbols, spaces, or an empty line. However the input is 80 characters or less per line and the sum is 10,000 or less.

Visual Presentation:

Sample Solution:

Java Code:

// Importing the Scanner class from java.util package
import java.util.Scanner;

// Main class named "Main"
public class Main
{
    // Main method to execute the program
    public static void main(String arg[])
    {
        // Creating a Scanner object to read input from the console
        Scanner in = new Scanner(System.in);

        // Initializing variables to store the count and temporary numeric value
        int count = 0;
        String tmp = "0";

        // Prompting the user to input some text and numeric values
		System.out.println("Input some text and numeric values:");

        // Converting the input string to a character array
        char ch[] = in.nextLine().toCharArray();

        // Looping through each character in the array
        for(int i = 0; i < ch.length; i++)
        {
            // Checking if the current character is a digit
            while(i < ch.length && (Character.isDigit(ch[i])))
            {
                // Concatenating digits to form a temporary numeric value
                tmp += ch[i];
                i++;
            }

            // Adding the numeric value to the count
            count += Integer.valueOf(tmp);

            // Resetting the temporary numeric value
            tmp = "0";
        }

        // Displaying the sum of the numeric values
		System.out.println("\nSum of the numeric values:");
        System.out.println(count);
    }
} 

Sample Output:

Input some text and numeric values:
5 apple and 10 orange are rotten in the basket

Sum of the numeric values:
15

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to extract all numbers from a multi-line text and compute their total sum.
• Write a Java program to sum numerical values in a sentence that includes both integers and decimal numbers.
• Write a Java program to identify and sum all numeric values in a string using regular expressions.
• Write a Java program to compute the sum of all positive integers found within a paragraph containing mixed characters.

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