Maths Class - C# Questions & Answers

This section of our 1000+ C# MCQs focuses on maths class in C# Programming Language.

1. Which of these classes contains only floating point functions?
a) Math
b) Process
c) System
d) Object
View Answer

Answer: a
Explanation: Math class contains all the floating point functions that are used for geometry, trigonometry, as well as several general purpose methods. Example : sin(), cos(), exp(), sqrt() etc.

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

```
 class Program
```
```
 {
```
```
     static void Main(string[] args)
```
```
     {
```
```
         double x = 2.0;  
```
```
         double y = 3.0;
```
```
         double z = Math.Pow( x, y );
```
```
         Console.WriteLine(z);
```
```
         Console.ReadLine();
```
```
     }
```
```
 }
```

a) 2.0
b) 4.0
c) 8
d) 8.0
View Answer

Answer: c
Explanation: None.
Output :

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

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```
 class Program
```
```
 {
```
```
     static void Main(string[] args)
```
```
     {
```
```
         double x = 4.772;
```
```
         double y = 4.76;
```
```
         double z = Math.Max(x, y);
```
```
         Console.WriteLine(z);
```
```
         Console.ReadLine();
```
```
     }
```
```
 }
```

a) true
b) false
c) 4.772
d) 4.76
View Answer

Answer: c
Explanation: None.
Output :

4.772

4. What is the value of double consonant ‘E’ defined in Math class?
a) approximately 3
b) approximately 3.14
c) approximately 2.72
d) approximately 0
View Answer

Answer: c
Explanation: None.

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

```
 public class A
```
```
 {
```
```
     public int x;
```
```
     public int y;
```
```
     public void display() 
```
```
     {
```

         Console.WriteLine(x + " " + y);

```
     }
```
```
 }
```
```
 class Program
```
```
 {
```
```
     static void Main(string[] args)
```
```
     {
```
```
         A obj1 = new A();
```
```
         A obj2 = new A();
```
```
         obj1.x = 1;
```
```
         obj1.y = 2;
```
```
         obj2 = obj1;
```
```
         obj1.display();
```
```
         obj2.display();
```
```
     }
```
```
 }
```

a) 1 2 0 0
b) 1 2 1 2
c) 0 0 0 0
d) Run time exception
View Answer

Answer: b
Explanation: None.
Output :

 1 2 1 2

6. What will be the output of the following C# code snippet?

```
class Program
```
```
{
```
```
    static void Main(string[] args)
```
```
    {
```
```
        int[] nums = { 1 };
```
```
        var posNums = from n in nums
```

                      select Math.Pow(4 ,3);

        Console.Write("The values in nums: ");

```
        foreach (int i in posNums) 
```
```
        Console.Write(i + " ");
```
```
        Console.WriteLine();
```
```
        Console.ReadLine();
```
```
    }
```
```
}
```

a) Run time error
b) 64
c) Compile time error
d) 81
View Answer

Answer: b
Explanation: None.
Output :

7. What will be the output of the following C# code snippet?

```
class Program
```
```
{
```
```
    static void Main(string[] args)
```
```
    {
```
```
        float x = 3.14F;
```
```
        int y = (int)Math.Abs(x);
```
```
        Console.WriteLine(y);
```
```
        Console.ReadLine();
```
```
    }
```
```
}
```

a) Compile time error
b) 3.14
c) 3
d) 4
View Answer

Answer: c
Explanation: None.
Output :

8. What will be the output of the following C# code snippet?

```
class Program
```
```
{
```
```
    static void Main(string[] args)
```
```
    {
```
```
        int x = 5;
```
```
        int y = (int)Math.Pow(x,2);
```
```
        int z = (int)Math.Pow(y, 2);
```
```
        Console.WriteLine(z);
```
```
        Console.ReadLine();
```
```
    }
```
```
}
```

a) 25
b) 625
c) Compile time error
d) Run time error
View Answer

Answer: b
Explanation: y = 25, z = 25*25 = 625
Output :

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

```
 class Program
```
```
 {
```
```
     static void Main(string[] args)
```
```
     {
```
```
         int[] nums = {3 ,1 ,2 ,5 ,4};
```
```
         var ltAvg = from n in nums
```

                     let x = nums.Average()

```
                     where n < x
```
```
                     select n;
```

         Console.WriteLine("The average is " + nums.Average());

```
         Console.ReadLine();
```
```
     }
```
```
 }
```

a) Run time error
b) 3
c) 5
d) Compile time error
View Answer

Answer: b
Explanation: Built in method of maths class Avg() id used
Output :

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

```
class Program
```
```
{
```
```
    static void Main(string[] args)
```
```
    {
```
```
        int y = (int)Math.Max(4,2);
```
```
        int z = (int)Math.Pow(y, 2);
```
```
        Console.WriteLine(z);
```
```
        Console.ReadLine();
```
```
    }
```
```
}
```

a) 4
b) Compile time error
c) 16
d) 89
View Answer

Answer: c
Explanation: Built in method of maths class, Max() is used to select maximum value among 4 and 2 and then y is squared using Pow() of math class and the value is stored in z.
Output :

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