C++ Programming Questions and Answers – Tuples – 2

This set of C++ Programming Multiple Choice Questions & Answers (MCQs) focuses on “Tuples – 2”.

1. Which of the following is correct about tuple_size?
a) Returns the number of elements in a tuple
b) Returns the maximum sized type element
c) Returns the total number of bits used by the tuple
d) Returns the sum of non-string values
View Answer

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

#include <iostream>
#include <string>
#include <tuple>
using namespace std;
int main()
{
	tuple <int, char, string> tp;
	tp = make_tuple(4, '1', "Hello");
	cout<<tuple_size<decltype(tp)>::value;
	return 0;
}

a) 11
b) 5
c) 4
d) 3
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3. Which of the following is correct about swap()?
a) Swaps first element of both tuples
b) Swaps two tuples
c) Swaps elements of a tuple alternatively
d) Swaps last elements of two tuples
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4. What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <tuple>
using namespace std;
int main()
{
	tuple <int, char, string> tp1;
	tuple <int, char, string> tp2;
	tp1 = make_tuple(6, 'a', "Hello");
	tp2 = make_tuple(9, 'z', "World");
	cout<<"("<<get<0>(tp1)<<", "<<get<1>(tp1)<<", "<<get<2>(tp1)<<")"<<endl;
	cout<<"("<<get<0>(tp2)<<", "<<get<1>(tp2)<<", "<<get<2>(tp2)<<")"<<endl;
	tp1.swap(tp2);
	cout<<"("<<get<0>(tp1)<<", "<<get<1>(tp1)<<", "<<get<2>(tp1)<<")"<<endl;
	cout<<"("<<get<0>(tp2)<<", "<<get<1>(tp2)<<", "<<get<2>(tp2)<<")"<<endl;
	return 0;
}

a)

(6, a, Hello)
(9, z, World)
(9, z, World)
(6, a, Hello)

b)

(6, a, Hello)
(9, z, World)
(6, a, Hello)
(9, z, World)

c)

(9, z, World)
(6, a, Hello)
(9, z, World)
(6, a, Hello)

d)

(6, a, Hello)
(6, a, Hello)
(9, z, World)
(9, z, World)

5. What is the use of tie() function?
a) Used to replace elements
b) Used to delete elements
c) Used to unpack the values of a tuple
d) Used to check whether two tuples are the same or not
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6. How many variants of tie() function is there?
a) 1
b) 2
c) 3
d) 4
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7. Which word is used to stop the unpacking of a value in a tuple?
a) stop
b) ignore
c) cancel
d) remain
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8. What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <tuple>
using namespace std;
int main()
{
	tuple <int, char, string> tp1;
	tp1 = make_tuple(6, 'a', "Hello");
	int x;
	char y;
	string z;
	tie(x,y,z) = tp1;
	cout<<"x: "<<x<<"\ny: "<<y<<"\nz: "<<z<<endl;
	return 0;
}

a)

Segmentation fault
z: Hello

b)

x: 6
z: Hello
y: a

c) Error
d)

x: 6
y: a

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

#include <iostream>
#include <string>
#include <tuple>
using namespace std;
int main()
{
	tuple <int, char, string> tp1;
	tp1 = make_tuple(6, 'a', "Hello");
	int x;
	string y;
	tie(x,ignore,y) = tp1;
	cout<<"x: "<<x<<"\ny: "<<y<<endl;
	return 0;
}

a)

x: 6
y: Hello

b)

y: Hello
x: 6

c) Error
d) Segmentation fault
View Answer

10. What is the use of tuple_cat() function?
a) Takes the union of two tuples
b) Takes the intersection of two tuples
c) Concatenates two tuples
d) Removes elements of the second tuple from first
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11. What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <tuple>
using namespace std;
int main()
{
	tuple <int, string> tp1;
	tuple <int, string> tp2;
	tp1 = make_tuple(0, "Hello");
	tp2 = make_tuple(1, "World");
	auto tp3 = tuple_cat(tp1, tp2);
	cout<<"("<<get<0>(tp3)<<", "<<get<1>(tp3)<<", "<<get<2>(tp3)<<", 
        "<<get<3>(tp3)<<")"<<endl;
	return 0;
}

a) (0, Hello, 1, World)
b) ()
c) (0, 1)
d) (Hello, World)
View Answer

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