Motorola Placement Paper -: .Net Questions With Answers

Motorola Previous Years Solved Sample Placement Papers

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

   using System;
   
   namespace MyApplication {
     class Program {
       static void Main(string[] args) {
         bool x = true;
         Console.Write(Convert.ToString(x));
       }
     }
   }
       

   A: True

   B: true

   C: False

   D: false

   Ans: A) True

   Explanation: In the above C# code, we are using Convert.ToString() method which converts a bool to string. Thus, the output will be "True".

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

   using System;
   
   namespace MyApplication {
     class Program {
       static void Main(string[] args) {
         double x = 10.25;
         Console.Write(Convert.ToInt32(x));
       }
     }
   }
       

   A: 10.30

   B: 10.25

   C: 10

   D: Error

   Ans: C) 10

   Explanation: In the above C# code, we are using Convert.ToInt32() method which converts a double to int. Thus, the output will be "10".

3. What is 'Console' in C#?

   A: Class

   B: Object

   C: Method

   D: Structure

   Ans: A) Class

   Explanation: In C#, the Console class is used to represent the standard input, output, and error streams for console applications.

4. What will be the output of the following C# code, if the input is 123?

   using System;
   
   namespace MyApplication {
     class Program {
       static void Main(string[] args) {
         Console.WriteLine("Enter a number:");
         int num = Console.ReadLine();
         Console.WriteLine("Given number is: " + num);
       }
     }
   }
       

   A: Given number is:123

   B: Given number is: 123

   C: Given number is: "123"

   D: Error

   Ans: D) Error

   Explanation: In C#, Console.ReadLine() is used to read a string. Here, we are trying to assign the input to an int variable directly, which causes an error. The error is: Cannot implicitly convert type 'string' to 'int'.

5. What will be the output of the following C# code, if the input is 123?

   using System;
   
   namespace MyApplication {
     class Program {
       static void Main(string[] args) {
         Console.WriteLine("Enter a number:");
         int num = Convert.ToInt32(Console.ReadLine());
         Console.WriteLine("Given number is: " + num);
       }
     }
   }
       

   A: Given number is:123

   B: Given number is: 123

   C: Given number is: "123"

   D: Error

   Ans: B) Given number is: 123

   Explanation: In C#, Console.ReadLine() reads input as a string. Using Convert.ToInt32(), we convert the input to an int, so there is no error. Output will be: Given number is: 123.

6. Which is/are the correct method(s) to input a float value in C#?

   A: Parse(Console.ReadLine())

   B: ToSingle(Console.ReadLine())

   C: ToFloat(Console.ReadLine())

   D: Both A and B

   E: Both A and C

   Ans: D) Both A and B

   Explanation: In C#, the following methods can be used to input a float value:

   • float.Parse(Console.ReadLine()): Parses a string to a float.
   • Convert.ToSingle(Console.ReadLine()): Converts a string to a single-precision floating-point number.

   ToFloat(Console.ReadLine()) is not a valid method in C#.