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Type Conversion in Python: int(), float(), str() and bool() Explained

Have you ever entered a number into a Python program but received an error when trying to perform a calculation? This is a common problem for beginners. It often happens because the data type of a value is different from what the program expects. For example, when you use Python's input() function, the value entered by the user is returned as a string. If you want to perform mathematical calculations with that value, you may need to convert it into a numeric type first. This process is called type conversion . In this article, we will learn what type conversion is, why it is useful, how to convert values using int() , float() , str() , and bool() , and how to avoid common errors. 1. What Is Type Conversion in Python? Type conversion is the process of converting a value from one data type to another. For example, you may convert: A string into an integer. An integer into a floating-point number. A number into a string. A value into a Boolean value. Consider this example: number = ...
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Java Program to Calculate Total Marks and Average of Five Subjects

💡 Program Explanation

In this program:

  • The user will input marks of five subjects.

  • The program will calculate the total marks and average.

  • It will then display both results clearly.

🧑‍💻 Java Code:

// Java Program to Calculate Total Marks and Average of Five Subjects
import java.util.Scanner; // Importing Scanner class for user input

public class TotalAndAverage {
    public static void main(String[] args) {
        // Creating Scanner object to take input from user
        Scanner sc = new Scanner(System.in);

        // Declaring variables for five subjects
        double subject1, subject2, subject3, subject4, subject5;

        // Taking marks input for each subject
        System.out.print("Enter marks of Subject 1: ");
        subject1 = sc.nextDouble();

        System.out.print("Enter marks of Subject 2: ");
        subject2 = sc.nextDouble();

        System.out.print("Enter marks of Subject 3: ");
        subject3 = sc.nextDouble();

        System.out.print("Enter marks of Subject 4: ");
        subject4 = sc.nextDouble();

        System.out.print("Enter marks of Subject 5: ");
        subject5 = sc.nextDouble();

        // Calculating total marks
        double total = subject1 + subject2 + subject3 + subject4 + subject5;

        // Calculating average marks
        double average = total / 5;

        // Displaying the results
        System.out.println("\n------ Result ------");
        System.out.println("Total Marks = " + total);
        System.out.println("Average Marks = " + average);

        // Closing the scanner
        sc.close();
    }
}

🧠 Explanation (Line-by-Line):

Line Explanation
import java.util.Scanner; Imports the Scanner class from the java.util package for taking user input.
public class TotalAndAverage Defines the main class named TotalAndAverage.
Scanner sc = new Scanner(System.in); Creates a Scanner object to read input from the keyboard.
double subject1, subject2, subject3, subject4, subject5; Declares variables to store marks for five subjects. Using double allows decimal marks.
System.out.print("Enter marks of Subject 1: "); Prompts user to input marks for Subject 1.
subject1 = sc.nextDouble(); Reads the marks entered by the user.
(Same for subject2 to subject5) Repeats input for all five subjects.
double total = subject1 + subject2 + subject3 + subject4 + subject5; Calculates total marks.
double average = total / 5; Divides the total by 5 to get the average.
System.out.println("Total Marks = " + total); Displays the total marks.
System.out.println("Average Marks = " + average); Displays the average marks.
sc.close(); Closes the Scanner to avoid resource leaks.

🧾 Sample Output:

Enter marks of Subject 1: 85
Enter marks of Subject 2: 90
Enter marks of Subject 3: 78
Enter marks of Subject 4: 88
Enter marks of Subject 5: 92

------ Result ------
Total Marks = 433.0
Average Marks = 86.6

🏁 Conclusion:

This Java program efficiently calculates:

  • ✅ Total marks obtained in 5 subjects

  • ✅ Average marks
    It’s simple, easy to understand, and perfect for beginners learning basic arithmetic operations and user input in Java.

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