Java Code to Compare Three Variables

• We have three variables: num1, num2, and num3.
• The if-else block compares the values:
  • If num1 is greater than or equal to both num2 and num3, then it is the greatest.
  • Otherwise, if num2 is greater than or equal to both num1 and num3, then num2 is the greatest.
  • If neither of the above is true, then num3 is the greatest.

Important Note:

This logic works even if some of the variables have equal values. For example, if num1, num2, and num3 are all equal, the program will still return one of the values as the greatest (since they are all the same).

To handle the case where all three variables are equal, you can add additional checks to specifically detect when the values are equal. Here's an updated version of the code that accounts for this condition and prints an appropriate message if all the values are the same:

<span class="pln">
</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">CompareThreeNumbers</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pun">[]</span><span class="pln"> args</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
        </span><span class="com">// Define three variables</span><span class="pln">
        </span><span class="kwd">int</span><span class="pln"> num1 </span><span class="pun">=</span><span class="pln"> </span><span class="lit">20</span><span class="pun">;</span><span class="pln">
        </span><span class="kwd">int</span><span class="pln"> num2 </span><span class="pun">=</span><span class="pln"> </span><span class="lit">20</span><span class="pun">;</span><span class="pln">
        </span><span class="kwd">int</span><span class="pln"> num3 </span><span class="pun">=</span><span class="pln"> </span><span class="lit">20</span><span class="pun">;</span><span class="pln">

        </span><span class="com">// Check if all three numbers are equal</span><span class="pln">
        </span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">num1 </span><span class="pun">==</span><span class="pln"> num2 </span><span class="pun">&amp;&amp;</span><span class="pln"> num2 </span><span class="pun">==</span><span class="pln"> num3</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
            </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"All numbers are equal: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> num1</span><span class="pun">);</span><span class="pln">
        </span><span class="pun">}</span><span class="pln">
        </span><span class="com">// Logic to find the greatest number if they are not all equal</span><span class="pln">
        </span><span class="kwd">else</span><span class="pln"> </span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">num1 </span><span class="pun">&gt;=</span><span class="pln"> num2 </span><span class="pun">&amp;&amp;</span><span class="pln"> num1 </span><span class="pun">&gt;=</span><span class="pln"> num3</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
            </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"The greatest number is: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> num1</span><span class="pun">);</span><span class="pln">
        </span><span class="pun">}</span><span class="pln"> </span><span class="kwd">else</span><span class="pln"> </span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">num2 </span><span class="pun">&gt;=</span><span class="pln"> num1 </span><span class="pun">&amp;&amp;</span><span class="pln"> num2 </span><span class="pun">&gt;=</span><span class="pln"> num3</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
            </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"The greatest number is: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> num2</span><span class="pun">);</span><span class="pln">
        </span><span class="pun">}</span><span class="pln"> </span><span class="kwd">else</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
            </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"The greatest number is: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> num3</span><span class="pun">);</span><span class="pln">
        </span><span class="pun">}</span><span class="pln">
    </span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span>

Explanation of Changes:

1. Check for equality: Before comparing the values, the code first checks if all three variables (num1, num2, and num3) are equal using the condition if (num1 == num2 && num2 == num3). If this condition is true, it prints a message indicating that all the numbers are equal.

2. Handling the greatest number: If the values are not all equal, the program proceeds with the regular comparison logic to determine the greatest value.

This solution ensures that when all the variables have the same value, a message indicating that they are equal will be displayed, and the logic for finding the greatest value will only run when the numbers are different.