Pointers and References in C++ MCQ question and answer with solution

41.
How are the constants declared?

A. const keyword

B. #define preprocessor

C. both const keyword and #define preprocessor

D. $define

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42.

What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <cstdlib>
 
using namespace std;
 
int main(int argc, char const *argv[])
{
	int a = 5;
	int *p = &a;
	int &q = a;
	cout<<p<<endl;
	cout<<q<<endl;
	return 0;
}

A. Address of a followed by 5 in next line

B. Address of p followed by 5 in next line

C. Address of a followed by Address of a in next line

D. Address of p followed by Address of q in next line

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43.
How to declare a wide character in the string literal?

A. L prefix

B. l prefix

C. W prefix

D. Z prefix

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44.

What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <cstdlib>
 
using namespace std;
 
int main(int argc, char const *argv[])
{
	int a = 5;
	int *p = &a;
	int &q = a;
	cout<<*p<<endl;
	cout<<*q<<endl;
	return 0;
}

A. Address of a followed by 5 in next line

B. Address of p followed by 5 in next line

C. Run time error

D. Compile time error

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45.
Pick the correct statement about references.

A. References can be assigned value NULL

B. References once assigned cannot be changed to refer another variable

C. Reference should not be initialized when created

D. Reference is the same as pointers

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46.

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
int main ()
{
    int numbers[5];
    int * p;
    p = numbers;  *p = 10;
    p++;  *p = 20;
    p = &numbers[2];  *p = 30;
    p = numbers + 3;  *p = 40;
    p = numbers;  *(p + 4) = 50;
    for (int n = 0; n < 5; n++)
       cout << numbers[n] << ",";
    return 0;
}

A. 10,20,30,40,50,

B. 1020304050

C. compile error

D. runtime error

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47.

What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <cstdlib>
 
using namespace std;
 
void func(const int &a)
{
	int temp = 10;
	a = temp;
	cout<<a;
}
 
int main(int argc, char const *argv[])
{
	int a = 5;
	func(a);
	return 0;
}

A. 5

B. 10

C. Error

D. Segmentation fault

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48.

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
int main()
{
    int i;
    char c;
    void *data;
    i = 2;
    c = 'd';
    data = &i;
    cout << "the data points to the integer value" << data;
    data = &c;
    cout << "the data now points to the character" << data;
    return 0;
}

A. 2d

B. two memory addresses

C. 3d

D. 4d

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49.

Regarding the following statement which of the statements is true?

const int a = 100;

A. Declares a variable a with 100 as its initial value

B. Declares a construction a with 100 as its initial value

C. Declares a constant a whose value will be 100

D. Constructs an integer type variable with an as identifier and 100 as the value

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50.

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
int main()
{
    char *ptr;
    char Str[] = "abcdefg";
    ptr = Str;
    ptr += 5;
    cout << ptr;
    return 0;
}

A. fg

B. cdef

C. defg

D. abcd

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41.
How are the constants declared?

Answer & Solution

42.
What will be the output of the following C++ code?

`#include <iostream> #include <string> #include <cstdlib> using namespace std; int main(int argc, char const argv[]) { int a = 5; int p = &a; int &q = a; cout<<p<<endl; cout<<q<<endl; return 0; }`

Answer & Solution

43.
How to declare a wide character in the string literal?

Answer & Solution

44.
What will be the output of the following C++ code?

`#include <iostream> #include <string> #include <cstdlib> using namespace std; int main(int argc, char const argv[]) { int a = 5; int p = &a; int &q = a; cout<<p<<endl; cout<<q<<endl; return 0; }`

Answer & Solution

45.
Pick the correct statement about references.

Answer & Solution

Answer & Solution

47.
What will be the output of the following C++ code?

`#include <iostream> #include <string> #include <cstdlib> using namespace std; void func(const int &a) { int temp = 10; a = temp; cout<<a; } int main(int argc, char const *argv[]) { int a = 5; func(a); return 0; }`

Answer & Solution

48.
What will be the output of the following C++ code?

`#include <iostream> using namespace std; int main() { int i; char c; void *data; i = 2; c = 'd'; data = &i; cout << "the data points to the integer value" << data; data = &c; cout << "the data now points to the character" << data; return 0; }`

Answer & Solution

49.
Regarding the following statement which of the statements is true?

`const int a = 100;`

Answer & Solution

50.
What will be the output of the following C++ code?

`#include <iostream> using namespace std; int main() { char *ptr; char Str[] = "abcdefg"; ptr = Str; ptr += 5; cout << ptr; return 0; }`

Answer & Solution

Pointers and References in C++ MCQ question and answer with solution | C++ Programimg MCQs

41. How are the constants declared?

Answer & Solution

42. What will be the output of the following C++ code? #include <iostream> #include <string> #include <cstdlib> using namespace std; int main(int argc, char const *argv[]) { int a = 5; int *p = &a; int &q = a; cout<<p<<endl; cout<<q<<endl; return 0; }

Answer & Solution

43. How to declare a wide character in the string literal?

Answer & Solution

44. What will be the output of the following C++ code? #include <iostream> #include <string> #include <cstdlib> using namespace std; int main(int argc, char const *argv[]) { int a = 5; int *p = &a; int &q = a; cout<<*p<<endl; cout<<*q<<endl; return 0; }

Answer & Solution

45. Pick the correct statement about references.

Answer & Solution

Answer & Solution

47. What will be the output of the following C++ code? #include <iostream> #include <string> #include <cstdlib> using namespace std; void func(const int &a) { int temp = 10; a = temp; cout<<a; } int main(int argc, char const *argv[]) { int a = 5; func(a); return 0; }

Answer & Solution

48. What will be the output of the following C++ code? #include <iostream> using namespace std; int main() { int i; char c; void *data; i = 2; c = 'd'; data = &i; cout << "the data points to the integer value" << data; data = &c; cout << "the data now points to the character" << data; return 0; }

Answer & Solution

49. Regarding the following statement which of the statements is true? const int a = 100;

Answer & Solution

50. What will be the output of the following C++ code? #include <iostream> using namespace std; int main() { char *ptr; char Str[] = "abcdefg"; ptr = Str; ptr += 5; cout << ptr; return 0; }

Answer & Solution

41.
How are the constants declared?

42.
What will be the output of the following C++ code?

`#include <iostream> #include <string> #include <cstdlib> using namespace std; int main(int argc, char const argv[]) { int a = 5; int p = &a; int &q = a; cout<<p<<endl; cout<<q<<endl; return 0; }`

43.
How to declare a wide character in the string literal?

44.
What will be the output of the following C++ code?

`#include <iostream> #include <string> #include <cstdlib> using namespace std; int main(int argc, char const argv[]) { int a = 5; int p = &a; int &q = a; cout<<p<<endl; cout<<q<<endl; return 0; }`

45.
Pick the correct statement about references.

47.
What will be the output of the following C++ code?

`#include <iostream> #include <string> #include <cstdlib> using namespace std; void func(const int &a) { int temp = 10; a = temp; cout<<a; } int main(int argc, char const *argv[]) { int a = 5; func(a); return 0; }`

49.
Regarding the following statement which of the statements is true?

`const int a = 100;`

50.
What will be the output of the following C++ code?

`#include <iostream> using namespace std; int main() { char *ptr; char Str[] = "abcdefg"; ptr = Str; ptr += 5; cout << ptr; return 0; }`