C++ Programming Questions and Answers - Vector Arithmetic

This set of C++ Programming Multiple Choice Questions & Answers (MCQs) focuses on “Vector Arithmetic”.

1. Which of the following library is used to do vector arithmetic?
a) Boost
b) Time
c) OpenGL
d) OpenDL
View Answer

Answer: a
Explanation: Boost package has a linear algebra package that may well suits for vector arithmetic.

2. Which header file is used to manipulate the vector algebra in c++?
a) math
b) cmath
c) vmath
d) dmath
View Answer

Answer: c
Explanation: vmath is set of C++ classes for Vector and Matrix algebra used in the programs.

3. What type of reference should be used in vector arithmetic?
a) dynamic
b) const
c) both dynamic & const
d) static
View Answer

Answer: b
Explanation: As we are using the vector and it will give accurate result if we use const reference.

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

```
    #include <iostream>
```
```
    using namespace std;
```
```
    class vec
```
```
    {
```
```
        public:
```
```
        vec(float f1, float f2) 
```
```
        {
```
```
            x = f1;
```
```
            y = f2;
```
```
        }
```
```
        vec()
```
```
        {
```
```
        }
```
```
        float x;
```
```
        float y;
```
```
    };
```
```
    vec addvectors(vec v1, vec v2);
```
```
    int main() 
```
```
    {
```
```
        vec v1(3, 6);
```
```
        vec v2(2, -2);
```
```
        vec v3 = addvectors(v1, v2);
```

        cout << v3.x << ", " << v3.y << endl;

```
    }
```
```
    vec addvectors(vec v1, vec v2)
```
```
    {
```
```
        vec result;
```
```
        result.x = v1.x + v2.x;
```
```
        result.y = v1.y + v2.y;
```
```
        return result;
```
```
    };
```

a) 4, 5
b) 4, 4
c) 5, 4
d) 5, 5
View Answer

Answer: c
Explanation: In this program, We are adding two vectors by using standalone function and printing it.
Output:

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$ g++ vecar.cpp
$ a.out
5, 4

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

```
    #include <iostream>
```
```
    #include <vector>
```
```
    using namespace std;
```
```
    int main ()
```
```
    {
```
```
        vector<bool> mask;
```
```
        mask.push_back(true);
```
```
        mask.flip();
```
```
        cout << boolalpha;
```

        for (unsigned i = 0; i < mask.size(); i++)

```
        cout << mask.at(i);
```
```
        return 0;
```
```
    }
```

a) false
b) true
c) false & true
d) alpha
View Answer

Answer: a
Explanation: In this program, We are flipping the vector values by using flip function.
Output:

$ g++ vecar1.cpp
$ a.out
false

6. What will be the type of output of vector cross product?
a) Scalar
b) Vector
c) Both Scalar & Vector
d) Linear
View Answer

Answer: b
Explanation: Cross product of two vectors results into a vector.

7. Which function is used to optimize the space in vector?
a) at
b) bool
c) operator
d) operand
View Answer

Answer: b
Explanation: This is a specialized version of vector, which is used for elements of type bool and optimizes for space.

8. What is the use of vector arithmetic in c++?
a) Computer graphics
b) Computer booting
c) Both Computer graphics & Computer booting
d) Computer Networks
View Answer

Answer: a
Explanation: Computer graphics is the use of vector arithmetic in c++.

Sanfoundry Global Education & Learning Series – C++ Programming Language.

To practice all areas of C++ language, here is complete set of 1000+ Multiple Choice Questions and Answers.

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