Basic Syntax and Data Types in C Sharp
practice.

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

string s1 = " I AM BEST ";
string s2;
s2 = s1.substring (5, 4);
Console.WriteLine (s2);

What is the need for 'Conversion of data type' in C#?

Scope of variable is related to definition of variable as:
i. Region of code within which variable value is valid and hence can be accessed.
ii. No, relation with region where variable is declared its value is valid in entire scope.

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

class Program
{
    static void Main(string[] args)
    {
        int i ;
        for ( i = 0; i < 5; i++)
        {
            int j = 0;
            j += i; 
            Console. WriteLine(j);
        }
        Console. WriteLine(i);
        Console. ReadLine();
    }
}

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

static void Main(string[] args)
{
    char c = 'g';
    string s = c.ToString();
    string s1 = "I am a human being" + c;
    Console.WriteLine(s1);
    Console.ReadLine();
}

DIFFERENCE BETWEEN KEYWORDS 'VAR' AND 'DYNAMIC'?

Which of the conversions are valid for the following C# code?

static void Main(string[] args)
{
    int a = 22;
    long b = 44;
    double c = 1.406;
    b = a;
    c = a;
    a = b;
    b = c;
}

Select differences between reference type and value type:
i. Memory allocated to 'Value type' is from heap and reference type is from 'System. ValueType'
ii. Memory allocated to 'Value type' is from 'System. ValueType' and reference type is from 'Heap'
iii. Structures, enumerated types derived from 'System. ValueType' are created on stack, hence known as ValueType and all 'classes' are reference type because values are stored on heap

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

static void Main(string[] args)
{
    const int a = 5;
    const int b = 6;
    for (int i = 1; i <= 5; i++)
    {
        a = a * i;
        b = b * i;
    }
    Console.WriteLine(a);
    Console.WriteLine(b);
    Console.ReadLine();
}

A float occupies 4 bytes. If the hexadecimal equivalent of these 4 bytes are A, B, C and D, then when this float is stored in memory in which of the following order do these bytes gets stored?

Default Type of number without decimal is?

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

static void Main(string[] args)
{
    string Name = "He is playing in a ground.";
    char[] characters = Name.ToCharArray();
    StringBuilder sb = new StringBuilder();
    for (int i = Name.Length - 1; i >= 0; --i)
    {
        sb.Append(characters[i]);
    }
    Console.Write(sb.ToString());
    Console.ReadLine(); 
}

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

static void Main(string[] args)
{
    String name = "Dr.Gupta";
    Console.WriteLine("Good Morning" + name);
}

Disadvantages of Explicit Conversion are?

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

static void Main(string[] args)
{
    char a = 'A';
    string b = "a";
    Console.WriteLine(Convert.ToInt32(a));
    Console.WriteLine(Convert.ToInt32(Convert.ToChar(b)));
    Console.ReadLine();
}

What will be the error in the following C# code?

Static Void Main(String[] args)
{
    const int m = 100;
    int n = 10;
    const int k = n / 5 * 100 * n ;
    Console.WriteLine(m * k);
    Console.ReadLine();
}

The subset of 'int' data type is . . . . . . . .

Select a convenient declaration and initialization of a floating point number:

Why strings are of reference type in C#.NET?

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

class Program
{
    public static void Main(string[] args)
    {
        int i, j;
        i = (j = 5) + 10;
        Console. WriteLine(i);
        Console. WriteLine(j);
        Console. ReadLine();
    }
}