Expt 1 - Part 1, Part 2 & Part 3

Explanation

This Java code is designed to find the largest among three numbers provided by the user. It starts by setting up a way to read input from the keyboard. Then, it prompts the user to enter three integer values, one by one. These values are stored in variables named a, b, and c. The core of the program lies in its decision-making logic: it uses if-else if-else statements to compare these three numbers. First, it checks if a is greater than both b and c. If that's true, it declares a as the greatest. If not, it moves on to check if b is greater than both a and c. If this is true, b is declared the greatest. If neither a nor b satisfies their respective conditions, it means c must be the greatest (or tied for greatest), so c is declared as such. Finally, it prints the result to the console and closes the input resource.

Algorithm

The algorithm used to find the greatest of three numbers can be described as follows:

1. Start: Begin the program execution.
2. Initialize Input: Create an object of the Scanner class to read input from the console.
3. Get Input (Number 1):
   • Display a prompt asking the user to enter the first number.
   • Read the integer entered by the user and store it in a variable named a.
4. Get Input (Number 2):
   • Display a prompt asking the user to enter the second number.
   • Read the integer entered by the user and store it in a variable named b.
5. Get Input (Number 3):
   • Display a prompt asking the user to enter the third number.
   • Read the integer entered by the user and store it in a variable named c.
6. Compare and Determine Greatest:
   • Condition 1: Check if a is greater than b AND a is greater than c.
     • If true, then a is the greatest. Proceed to Step 7.
   • Condition 2 (Else if): If Condition 1 was false, check if b is greater than a AND b is greater than c.
     • If true, then b is the greatest. Proceed to Step 7.
   • Condition 3 (Else): If both Condition 1 and Condition 2 were false, then c must be the greatest (or tied).
     • Declare c as the greatest. Proceed to Step 7.
7. Display Result: Print a message to the console indicating which number is the greatest.
8. Close Resources: Close the Scanner object to release system resources.
9. End: Terminate the program.