Arrays and Strings in C Sharp MCQ question and answer with solution

1

Keyword used to define call by reference parameter in C# .NET?

A) & B) out C) ref D) &&

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Answer & Solution

Answer: Option C

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2

How is a string typically processed?

A) On a character by character basis B) On a string by string basis C) Both On a character by character basis & On a string by string basis D) None of the mentioned

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Answer & Solution

Answer: Option A

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3

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

class Program
{
    static void Main(string[] args)
    { 
        String c = "i love Csharp";
        bool a;
        a = c.StartsWith("I");
        Console.WriteLine(a);
        Console.ReadLine();
    }
}

A) true B) false C) 0 D) 1

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Answer & Solution

Answer: Option B

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4

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

class Program
{
    static void Main(string[] args)
    {
        int i = 5;
        int j;
        method1(ref i);
        method2(out j);
        Console.writeline(i + "  " + j);
    }
    static void method1(ref int x)
    { 
        x = x + x;
    }
    static void method2(out int x)
    {
        x = 6;
        x = x * x;
    }
}

A) 36, 10 B) 10, 36 C) 0, 0 D) 36, 0

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Answer & Solution

Answer: Option B

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5

Which is the correct way of defining and initializing an array of 3 integers?

A)

int[] a={78, 54};

B)

int[] a;
a = new int[3];
a[1] = 78;
a[2] = 9;
a[3] = 54;

C)

int[] a;
a = new int{78, 9, 54};

D)

int[] a;
a = new int[3]{78, 9, 54};

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Answer & Solution

Answer: Option D

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6

What is the advantage of using 2D jagged array over 2D rectangular array?

A) Easy initialization of elements B) Allows unlimited elements as well as rows which had '0' or are empty in nature C) All of the mentioned D) None of the mentioned

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Answer & Solution

Answer: Option B

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7

Which of the following statements are correct?

A) C SHARP allows a function to have arguments with default values B) C SHARP allows a function to have variable number of arguments C) Params are used to specify the syntax for a function having arguments D) Omitting the return value type in method definition results into an exception

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Answer & Solution

Answer: Option B

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8

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

static void main(string[] args)
{
    int n = 1;
    method(n);
    console.Writeline(n);
    method1(ref n);
    console.Writeline(n);
}
static void method(int num)
{
    num += 20;
    console.writeline(num);
}
static void method1(ref int num)
{
    num += 20;
    console.writeline(num);
}

A) 1
1
1
1 B) 21
1
21
21 C) 11
21
21
11 D) Error

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Answer & Solution

Answer: Option B

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9

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

static void Main(string[] args)
{
    String c = "Hello";
    String a = c + "Bye";
    Console.WriteLine(a);
    Console.ReadLine();
}

A) "Hello Bye" B) "HelloBye" C) Hello Bye D) HelloBye

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Answer & Solution

Answer: Option D

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10

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

static void Main(string[] args)
{
    char A = 'K';
    char B = Convert.ToChar(76);
    A++;
    B++;
    Console.WriteLine(A+ "  " +B);
    Console.ReadLine();
}

A) M L B) U L C) L M D) A B

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Answer & Solution

Answer: Option C

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Arrays and Strings in C Sharp MCQ question and answer with solution | C# Program MCQs