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<h1>C++ Test</h1>
Author : Geeks For Geeks<br />
Last Updated : March, 2020</span><br>
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<h1 class="entry-title">C++ Language<h1>
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<p>Predict the output of the following C++ programs.</p>
<p><strong>Question 1</strong></p>
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<div class="line number1 index0 alt2"><code class="preprocessor">#include <iostream> </code></div>
<div class="line number2 index1 alt1"><code class="keyword bold">using</code> <code class="keyword bold">namespace</code> <code class="plain">std; </code></div>
<div class="line number3 index2 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number4 index3 alt1"><code class="color1 bold">int</code> <code class="plain">main() </code></div>
<div class="line number5 index4 alt2"><code class="plain">{ </code></div>
<div class="line number6 index5 alt1"><code class="undefined spaces"> </code><code class="color1 bold">int</code> <code class="plain">a = b = c = 0; </code></div>
<div class="line number7 index6 alt2"><code class="undefined spaces"> </code><code class="plain">cout << a << </code><code class="string">"*"</code> <code class="plain"><< b << </code><code class="string">"*"</code> <code class="plain"><< c; </code></div>
<div class="line number8 index7 alt1"><code class="undefined spaces"> </code><code class="keyword bold">return</code> <code class="plain">0; </code></div>
<div class="line number9 index8 alt2"><code class="plain">} </code></div>
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<p>Output:</p><br><div id="AP_G4GR_5"><div id="c9541d0b-2b1f-47f8-8b8b-63e4e11f2de9" data-section="c9541d0b-2b1f-47f8-8b8b-63e4e11f2de9" class="_ap_apex_ad" data-xpath="#AP_G4GR_5" data-section-id="" data-render-time="1584531639903" data-refresh-time="1584531639904" data-timeout="12" style="display: block; clear: both; text-align: center; margin: 10px auto;"><div id="ADP_40792_728X280_c9541d0b-2b1f-47f8-8b8b-63e4e11f2de9" style="margin: 0 auto" data-google-query-id="CNCNqcX4o-gCFa-USwUdy5QIWw">
</div></div></div><br>
<pre>Compile time error!
</pre>
<p><strong>Explanation:</strong><br>
A chained statement cannot be used to initialize variables at the time of declaration. Hence the statement a = b = c = 0; is an illegal statement. However following way a legal syntax and can be used in C++ or C.</p>
<pre>int a,b,c;
a = b = c = 0;
</pre>
<p>
<br>
<strong>Question 2</strong></p>
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<div class="line number1 index0 alt2"><code class="preprocessor">#include <iostream> </code></div>
<div class="line number2 index1 alt1"><code class="keyword bold">using</code> <code class="keyword bold">namespace</code> <code class="plain">std; </code></div>
<div class="line number3 index2 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number4 index3 alt1"><code class="color1 bold">int</code> <code class="plain">main() </code></div>
<div class="line number5 index4 alt2"><code class="plain">{ </code></div>
<div class="line number6 index5 alt1"><code class="undefined spaces"> </code><code class="keyword bold">for</code> <code class="plain">( ; ; ) cout << </code><code class="string">"blank"</code><code class="plain">; </code></div>
<div class="line number7 index6 alt2"><code class="undefined spaces"> </code><code class="keyword bold">return</code> <code class="plain">0; </code></div>
<div class="line number8 index7 alt1"><code class="plain">} </code></div>
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<p>Output:</p>
<pre>Infinite Loop!
</pre>
<p><strong>Explanation:</strong><br>
Since the initialization, test condition and increment/decrement condition is missing inside for loop the execution will be caught in infinite loop.</p>
<p>
<br>
<strong>Question 3</strong></p>
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<div class="line number1 index0 alt2"><code class="preprocessor">#include <iostream> </code></div>
<div class="line number2 index1 alt1"><code class="keyword bold">using</code> <code class="keyword bold">namespace</code> <code class="plain">std; </code></div>
<div class="line number3 index2 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number4 index3 alt1"><code class="color1 bold">int</code> <code class="plain">main() </code></div>
<div class="line number5 index4 alt2"><code class="plain">{ </code></div>
<div class="line number6 index5 alt1"><code class="undefined spaces"> </code><code class="color1 bold">int</code> <code class="plain">i; </code></div>
<div class="line number7 index6 alt2"><code class="undefined spaces"> </code><code class="keyword bold">for</code> <code class="plain">(i=0; i<3; i++); </code></div>
<div class="line number8 index7 alt1"><code class="undefined spaces"> </code> </div>
<div class="line number9 index8 alt2"><code class="undefined spaces"> </code><code class="plain">cout << </code><code class="string">"hello!"</code> <code class="plain"><<i; </code></div>
<div class="line number10 index9 alt1"><code class="undefined spaces"> </code> </div>
<div class="line number11 index10 alt2"><code class="undefined spaces"> </code><code class="keyword bold">return</code> <code class="plain">0; </code></div>
<div class="line number12 index11 alt1"><code class="undefined spaces"> </code> </div>
<div class="line number13 index12 alt2"><code class="plain">} </code></div>
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<p>Output:</p>
<pre>hello!3
</pre>
<p><strong>Explanation:</strong><br>
Hello!3 is the result because when for loop executes it does not have any task to do due to the semi-colon(;) present in the line where for loop has been defined. The loop will execute three times and the value of i will become 3 then rest of the statement(s) will execute.</p>
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<br>
<strong>Question 4</strong></p>
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<div class="line number1 index0 alt2"><code class="preprocessor">#include <iostream> </code></div>
<div class="line number2 index1 alt1"><code class="keyword bold">using</code> <code class="keyword bold">namespace</code> <code class="plain">std; </code></div>
<div class="line number3 index2 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number4 index3 alt1"><code class="color1 bold">int</code> <code class="plain">main() </code></div>
<div class="line number5 index4 alt2"><code class="plain">{ </code></div>
<div class="line number6 index5 alt1"><code class="undefined spaces"> </code><code class="color1 bold">int</code> <code class="plain">i; </code></div>
<div class="line number7 index6 alt2"><code class="undefined spaces"> </code><code class="plain">i = 1 + (1,4,5,6,3); </code></div>
<div class="line number8 index7 alt1"><code class="undefined spaces"> </code><code class="plain">cout << i; </code></div>
<div class="line number9 index8 alt2"><code class="undefined spaces"> </code><code class="keyword bold">return</code> <code class="plain">0; </code></div>
<div class="line number10 index9 alt1"><code class="plain">} </code></div>
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<p>Output:</p>
<pre>4
</pre>
<p><strong>Explanation:</strong><br>
The comma (,) operator is a binary operator that evaluates the first operand and discards the result and then evaluates the second and then returns the value of second. Here the associativity of the comma (,) operator is from left to right and is easy to understand that the expression(1,4,5,6,3) evaluates to be 3 and then the result 1 + 3 is assigned to i.</p><br><div id="AP_G4GR_6"><div id="76621e0b-1fac-4840-ba08-8ec48d007bc6" data-section="76621e0b-1fac-4840-ba08-8ec48d007bc6" class="_ap_apex_ad" data-xpath="#AP_G4GR_6:eq(0)" data-section-id="" data-render-time="1584531639906" style="display: block; clear: both; text-align: center; margin: 10px auto;"><div id="ADP_40792_728X280_76621e0b-1fac-4840-ba08-8ec48d007bc6" style="margin: 0 auto" data-google-query-id="CNGNqcX4o-gCFa-USwUdy5QIWw">
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<strong>Question 5</strong></p>
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<div class="line number1 index0 alt2"><code class="preprocessor">#include <iostream> </code></div>
<div class="line number2 index1 alt1"><code class="keyword bold">using</code> <code class="keyword bold">namespace</code> <code class="plain">std; </code></div>
<div class="line number3 index2 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number4 index3 alt1"><code class="color1 bold">int</code> <code class="plain">main() </code></div>
<div class="line number5 index4 alt2"><code class="plain">{ </code></div>
<div class="line number6 index5 alt1"><code class="undefined spaces"> </code><code class="color1 bold">int</code> <code class="plain">a = 0, b; </code></div>
<div class="line number7 index6 alt2"><code class="undefined spaces"> </code><code class="plain">b = (a = 50) + 10; </code></div>
<div class="line number8 index7 alt1"><code class="undefined spaces"> </code><code class="plain">cout << a << </code><code class="string">"$"</code> <code class="plain"><< b; </code></div>
<div class="line number9 index8 alt2"><code class="undefined spaces"> </code><code class="keyword bold">return</code> <code class="plain">0; </code></div>
<div class="line number10 index9 alt1"><code class="plain">} </code></div>
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<p>Output:</p>
<pre>50$60
</pre>
<p><strong>Explanation:</strong><br>
The statement b = (a = 50) + 10; uses the concept of embedded assignment. Here, the value of 50 is assigned to variable a and the result 50+10 is assigned to b.</p>
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<p><strong>Question 6</strong></p>
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<div class="line number1 index0 alt2"><code class="preprocessor">#include<iostream> </code></div>
<div class="line number2 index1 alt1"><code class="keyword bold">using</code> <code class="keyword bold">namespace</code> <code class="plain">std; </code></div>
<div class="line number3 index2 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number4 index3 alt1"><code class="color1 bold">int</code> <code class="plain">main() </code></div>
<div class="line number5 index4 alt2"><code class="plain">{ </code></div>
<div class="line number6 index5 alt1"><code class="undefined spaces"> </code><code class="color1 bold">char</code> <code class="plain">a = 30, b = 40, c = 10; </code></div>
<div class="line number7 index6 alt2"><code class="undefined spaces"> </code><code class="color1 bold">char</code> <code class="plain">d = (a*b)/c; </code></div>
<div class="line number8 index7 alt1"><code class="undefined spaces"> </code><code class="plain">cout << </code><code class="color1 bold">int</code><code class="plain">(d); </code></div>
<div class="line number9 index8 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number10 index9 alt1"><code class="undefined spaces"> </code><code class="keyword bold">return</code> <code class="plain">0; </code></div>
<div class="line number11 index10 alt2"><code class="plain">} </code></div>
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<p>Output:</p>
<pre>120
</pre>
<p><strong>Explanation:</strong><br>
The C++ can also perform arithmetic calculation considering the ASCII values of characters if the arithmetic operation are performed on variables of char datatype. Here in this case answer is 120 which is the ASCII value for x.</p>
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<strong>Question 7</strong></p>
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<div class="line number1 index0 alt2"><code class="preprocessor">#include<iostream> </code></div>
<div class="line number2 index1 alt1"><code class="keyword bold">using</code> <code class="keyword bold">namespace</code> <code class="plain">std; </code></div>
<div class="line number3 index2 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number4 index3 alt1"><code class="color1 bold">int</code> <code class="plain">main(</code><code class="color1 bold">int</code> <code class="plain">x) </code></div>
<div class="line number5 index4 alt2"><code class="plain">{ </code></div>
<div class="line number6 index5 alt1"><code class="undefined spaces"> </code><code class="keyword bold">static</code> <code class="color1 bold">int</code> <code class="plain">i = 5; </code></div>
<div class="line number7 index6 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number8 index7 alt1"><code class="undefined spaces"> </code><code class="keyword bold">if</code> <code class="plain">(--i) </code></div>
<div class="line number9 index8 alt2"><code class="undefined spaces"> </code><code class="plain">{ </code></div>
<div class="line number10 index9 alt1"><code class="undefined spaces"> </code><code class="plain">cout << i; </code></div>
<div class="line number11 index10 alt2"><code class="undefined spaces"> </code><code class="plain">main(10); </code></div>
<div class="line number12 index11 alt1"><code class="undefined spaces"> </code><code class="plain">} </code></div>
<div class="line number13 index12 alt2"><code class="undefined spaces"> </code><code class="keyword bold">return</code> <code class="plain">0; </code></div>
<div class="line number14 index13 alt1"><code class="plain">} </code></div>
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<p>Output:</p>
<pre>4321
</pre>
<p><strong>Explanation:</strong><br>
Any non-zero number in C++ is treated as true value. Here in this code the if statement tends to decrease the value of i but inside the block of if, the main() function is called again and again. Here the program seems to be in infinite loop but the variable i is static in nature it has its lifetime till execution hence the program will halt if i becomes 0.</p>
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<strong>Question 8</strong></p>
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<div class="line number1 index0 alt2"><code class="preprocessor">#include<iostream> </code></div>
<div class="line number2 index1 alt1"><code class="keyword bold">using</code> <code class="keyword bold">namespace</code> <code class="plain">std; </code></div>
<div class="line number3 index2 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number4 index3 alt1"><code class="color1 bold">int</code> <code class="plain">main(</code><code class="color1 bold">int</code> <code class="plain">x) </code></div>
<div class="line number5 index4 alt2"><code class="plain">{ </code></div>
<div class="line number6 index5 alt1"><code class="undefined spaces"> </code><code class="color1 bold">int</code> <code class="plain">i = 5; </code></div>
<div class="line number7 index6 alt2"><code class="undefined spaces"> </code> </div>
<div class="line number8 index7 alt1"><code class="undefined spaces"> </code><code class="keyword bold">if</code> <code class="plain">(--i) </code></div>
<div class="line number9 index8 alt2"><code class="undefined spaces"> </code><code class="plain">{ </code></div>
<div class="line number10 index9 alt1"><code class="undefined spaces"> </code><code class="plain">cout << i; </code></div>
<div class="line number11 index10 alt2"><code class="undefined spaces"> </code><code class="plain">main(10); </code></div>
<div class="line number12 index11 alt1"><code class="undefined spaces"> </code><code class="plain">} </code></div>
<div class="line number13 index12 alt2"><code class="undefined spaces"> </code><code class="keyword bold">return</code> <code class="plain">0; </code></div>
<div class="line number14 index13 alt1"><code class="plain">} </code></div>
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<p>Output:</p>
<pre>infinite loop
</pre>
<p><strong>Explanation:</strong><br>
Any non-zero number in C++ is treated as true value. Here in this code the if statement tends to decrease the value of i but inside the block of if, the main() function is called again and again (all the statements will now execute as if it is a new program) hence the program execution will be caught in infinite loop as there is no termination condition.</p>
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