C++ Programming Practice Test 8

1. What is the use of polar function?

Used to construct a complex number from the magnitude and real part

Used to construct a complex number from the real and imaginary part

Used to construct a complex number from magnitude and phase angle

Used to construct a complex number from argument and phase angle

2. Which of the following is corect way of constructing bitset using integer number?

bitset<size> b;

bitset<size> b(string("1100"));

bitset<size> b(12);

bitset<size> b(float(12));

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

#include <iostream>
#include <complex>
using namespace std;
int main()
{
	complex <double> cn(3.0, 4.0);
	cout<<"Norm is: "<<norm(cn)<<endl;
	return 0;
}

4. What is the use of is_same() function in C++?

To check if two variable is of array type or not

To check whether two variables are different or not

To check if a variable is array type or not

To check whether two variables have the same characteristics

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

#include <iostream>
#include <string>
using namespace std;
int main()
{
	cout<<extent<remove_extent<string[10][20]>::type>::value;
	cout<<extent<remove_extent<string[10][20][30]>::type>::value;
	return 0;
}

2030

1020

2020

1010

6. What is the use of sum() function in Valarray?

Returns new array after circular shifting elements by the given number

Returns new array after shifting elements by the given number

Returns the summation of all elements of Valarray

Applies the manipulation provided to all the elements of the array

7. What is bitset in C++?

Template class

C-like arrays of bool elements

An array of bools consuming one bit per element

Vector of bools

8. Which of the following relationships is uni-directional?

Composition

Both Aggregation and Composition

Association

Aggregation

9. What happens if a pair is not initialized?

Both first and second part is initialized a garbage value

Second is initialized to zero or null and first is initialized a garbage value

First is initialized to zero or null and second is initialized a garbage value

Both first and second part is initialized to zero or null

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

#include <iostream>
#include <bitset>
using namespace std;
int main()
{
	bitset<8> b1(95);
	bitset<8> b2(45);
	cout<<~b1<<endl;
	cout<<(b1|b2)<<endl;
	cout<<(b1&b2)<<endl;
}

10100000
01111111
00001101

10100000
00001111
00001101

10100000
01111111
00000000

11111111
01111111
00001101