{"id":124,"date":"2023-09-01T15:36:18","date_gmt":"2023-09-01T15:36:18","guid":{"rendered":"https:\/\/www.multiplechoicequestions.org\/?p=124"},"modified":"2023-09-01T15:46:03","modified_gmt":"2023-09-01T15:46:03","slug":"cpp-pointers-references-mcq","status":"publish","type":"post","link":"https:\/\/www.multiplechoicequestions.org\/cpp-programming\/cpp-pointers-references-mcq\/","title":{"rendered":"C++ Pointers &amp; References MCQ"},"content":{"rendered":"\n<p>In this post, we present you 10+ multiple-choice questions to test your knowledge of C++ pointers and references.<\/p>\n\n<p>Each question is followed by the correct answer and an explanation to help reinforce your knowledge.<\/p>\n\n<h2><span><!--more--><\/span>1. What does a pointer store?<\/h2>\n<div class=\"optioncontainer\">a) A memory address<\/div>\n<div class=\"optioncontainer\">b) A data type<\/div>\n<div class=\"optioncontainer\">c) A value directly<\/div>\n<div class=\"optioncontainer\">d) None of the above<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer1')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer1\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">a) A memory address<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>A pointer is used to store the memory address of a variable.<\/p>\n<\/div>\n\n<h2>2. Which operator is used to get the memory address of a variable?<\/h2>\n<div class=\"optioncontainer\">a) *<\/div>\n<div class=\"optioncontainer\">b) &amp;<\/div>\n<div class=\"optioncontainer\">c) -&gt;<\/div>\n<div class=\"optioncontainer\">d) &lt;&lt;<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer2')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer2\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">b) &amp;<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The address-of operator (&amp;) is used to fetch the memory address of a variable.<\/p>\n<\/div>\n\n<h2>3. What will the following declaration create?<\/h2>\n<div class=\"optioncontainer\">int *ptr = nullptr;<\/div>\n<div class=\"optioncontainer\">a) Integer variable named ptr<\/div>\n<div class=\"optioncontainer\">b) Pointer to a char<\/div>\n<div class=\"optioncontainer\">c) Null pointer to an integer<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer3')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer3\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">d) Pointer to a null integer<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>Answer: c) Null pointer to an integer<\/p>\n<\/div>\n\n<h2>4. What is a reference in C++?<\/h2>\n<div class=\"optioncontainer\">a) Another name for a pointer<\/div>\n<div class=\"optioncontainer\">b) An alias for an existing variable<\/div>\n<div class=\"optioncontainer\">c) A memory location<\/div>\n<div class=\"optioncontainer\">d) A type of function<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer4')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer4\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">b) An alias for an existing variable<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>A reference is an alias, or another name, for an already existing variable.<\/p>\n<\/div>\n\n<h2>5. How do you declare a reference to an integer?<\/h2>\n<div class=\"optioncontainer\">a) int* ref;<\/div>\n<div class=\"optioncontainer\">b) &amp;int ref;<\/div>\n<div class=\"optioncontainer\">c) int ref&amp;;<\/div>\n<div class=\"optioncontainer\">d) int&amp; ref;<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer5')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer5\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">d) int&amp; ref;<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>A reference is declared using the &#8216;&amp;&#8217; symbol after the type but before the identifier (variable name).<\/p>\n<\/div>\n\n<h2>6. Once a reference is initialized with a variable:<\/h2>\n<div class=\"optioncontainer\">a) It can be reassigned to another variable<\/div>\n<div class=\"optioncontainer\">b) It can&#8217;t refer to any other variables<\/div>\n<div class=\"optioncontainer\">c) It becomes a pointer<\/div>\n<div class=\"optioncontainer\">d) None of the above<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer6')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer6\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">b) It can&#8217;t refer to any other variables<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>Unlike pointers, once a reference is initialized with a variable, it cannot be reassigned to refer to another variable.<\/p>\n<\/div>\n\n<h2>7. Which of the following is the correct way to declare a pointer to an integer and assign it the address of an integer variable, num?<\/h2>\n<div class=\"optioncontainer\">a) int ptr = num;<\/div>\n<div class=\"optioncontainer\">b) int ptr = #<\/div>\n<div class=\"optioncontainer\">c) int ptr = #<\/div>\n<div class=\"optioncontainer\">d) int &amp;ptr = num;<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer7')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer7\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">b) int* ptr = #<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>A pointer is declared using the * symbol and is assigned the address of a variable using the &amp; operator.<\/p>\n<\/div>\n\n<h2>8. Which of the following accesses the value at the address stored in a pointer &#8216;ptr&#8217;?<\/h2>\n<div class=\"optioncontainer\">a) &amp;ptr<\/div>\n<div class=\"optioncontainer\">b) ptr<\/div>\n<div class=\"optioncontainer\">c) ptr<\/div>\n<div class=\"optioncontainer\">d) ptr<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer8')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer8\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">c) *ptr<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>The * operator (dereference operator) is used to access the value at the address stored in the pointer.<\/p>\n<\/div>\n\n<h2>9. If &#8216;ref&#8217; is a reference to a variable, which of the following is used to get its memory address?<\/h2>\n<div class=\"optioncontainer\">a) ref&amp;<\/div>\n<div class=\"optioncontainer\">b) &amp;ref<\/div>\n<div class=\"optioncontainer\">c) ref<\/div>\n<div class=\"optioncontainer\">d) ref<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer9')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer9\">\n\t<h3>Answer:<\/h3>\t\n<div class=\"optioncontainer\">b) &amp;ref<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>Just like any other variable, the memory address of a reference is obtained using the &amp; operator.<\/p>\n<\/div>\n\n<h2>10. What does the following statement do?<\/h2>\n<div class=\"optioncontainer\">int &amp;ref = *ptr;<\/div>\n<div class=\"optioncontainer\">a) It assigns the address of ptr to ref.<\/div>\n<div class=\"optioncontainer\">b) It makes ref an alias for the value pointed to by ptr.<\/div>\n<div class=\"optioncontainer\">c) It creates a new pointer ref and assigns it the value of ptr.<\/div>\n<button class=\"answer-explanation\" onclick=\"toggleAnswer('answer10')\">Click to View Answer and Explanation<\/button>\n<div class=\"answer\" id=\"answer10\">\n\t<h3>Answer:<\/h3>\t\n\t<div class=\"optioncontainer\">d) It gives a compile-time error.<\/div>\n\t<h3>Explanation:<\/h3>\n\t<p>Answer: b) It makes ref an alias for the value pointed to by ptr.<\/p>\n<\/div>\n\n<br \/><script>\n   window.onload = function() {\ndocument.getElementById('answer1').style.display = 'none';\ndocument.getElementById('answer2').style.display = 'none';\ndocument.getElementById('answer3').style.display = 'none';\ndocument.getElementById('answer4').style.display = 'none';\ndocument.getElementById('answer5').style.display = 'none';\ndocument.getElementById('answer6').style.display = 'none';\ndocument.getElementById('answer7').style.display = 'none';\ndocument.getElementById('answer8').style.display = 'none';\ndocument.getElementById('answer9').style.display = 'none';\ndocument.getElementById('answer10').style.display = 'none';\n    };\n\n    function toggleAnswer(answerId) {\n      var answer = document.getElementById(answerId);\n      if (answer.style.display === \"none\") {\n        answer.style.display = \"block\";\n      } else {\n        answer.style.display = \"none\";\n      }\n    }\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>In this post, we present you 10+ multiple-choice questions to test your knowledge of C++ pointers and references. 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