C# Multiple Choice Questions & Answers on Integer Data Types for Freshers

1. How many Bytes are stored by ‘Long’ Datatype in C# .net?

a) 8
b) 4
c) 2
d) 1

Answer: a

Explanation : ‘Long’ is the datatype keyword used for storing data of unlimited length so by definition its size is always maximum i.e 8.

2. Choose “.NET class” name from which datatype “UInt” is derived ?

a) System.Int16
b) System.UInt32
c) System.UInt64
d) System.UInt16

Answer: b

Explanation : By Defination class assigned to

a) System.Int16 = short.
b) System.UInt32 = UInt.
c) System.UInt64 = ULong.
d) System.UInt16 = UShort.

3. Correct Declaration of Values to variables ‘a’ and ‘b’?

a) int a = 32, b = 40.6;
b) int a = 42; b = 40;
c) int a = 32; int b = 40;
d) int a = b = 42;

Answer: c

Explanation : a) Although,declaration of ‘b’ and ‘a’ are correct but initialization of value to ‘b’ should be ‘int’ datatype not float.
b) Missing declaration type of ‘b’.
c) correctly declared datatypes ‘a’ and ‘b’.
d) ‘b’ can’t be assigned values before declaration.

4. Select error in the given program :

1.  Static Void Main(String[] args)

2.  {

3.      const int m = 100;

4.      int n = 10;

5.      const int k = n / 5 * 100 * n ;

6.      Console.WriteLine(m * k);

7.      Console.ReadLine();

8.  }

a) ‘k’ should not be declared constant
b) Expression assigned to ‘k’ should be constant in nature
c) Expression (m * k) is invalid
d) ‘m ‘ is declared in invalid format

Answer : b

Explanation :’k’ should be declared as const int k = 10/5 * 100*10 i.e only constant values should be assigned to a constant.

Output :Error 1 – The expression being assigned to ‘k’ must be constant.

5. Arrange the following datatype in order of increasing magnitude sbyte, short, long, int.

a) long < short < int < sbyte
b) sbyte < short < int < long
c) short < sbyte < int < long
d) short < int < sbyte < long

Answer : b

6. Which datatype should be more preferred for storing a simple number like 35 to improve execution speed of a program?

a) sbyte
b) short
c) int
d) long

Answer: a

Explanation : Wider datatype like int,long takes more time for manipulation of a program.

7. Which Conversion function of ‘Convert.TOInt32()’ and ‘Int32.Parse()’ is efficient?

1) Int32.Parse() is only used for strings and throws argument exception for null string
2) Convert.Int32() used for datatypes and returns directly ‘0’ for null string

a) 2
b) Both 1,2
c) 1
d) None of the mentioned

Answer: a

Explanation: Convenient for every datatype so mostly preferred.

8. Correct way to assign values to variable ‘c’ when int a=12, float b=3.5,int c;

a) c = a + b;
b) c = a + int(float(b));
c) c = a + convert.ToInt32(b);
d) c = int(a + b);

Answer: c

9. Correct Set of Code for given data ‘a’ and ‘b’ to print output for ‘c’ as 74 ?
a)

1.    int a = 12;

2.    float b = 6.2f;

3.    int c;

4.    c = a / b + a * b;

5.    Console.WriteLine(c);

b)

1.    int a = 12;

2.    float b = 6.2f;

3.    int c;

4.    c = a / convert.ToInt32(b) + a * b;

5.    Console.WriteLine(c);

c)

1.    int a = 12;

2.    float b = 6.2f;

3.    int c;

4.    c = a / convert.ToInt32(b) + a * convert.ToInt32(b);

5.    Console.WriteLine(c);

d)

1.     int a = 12;

2.     float b = 6.2f;

3.     int c;

4.     c = convert.ToInt32(a / b + a * b);

5.     Console.WriteLine(c);

Answer: c

Explanation:Usage of typecasting operation. Seperately check each expression taking typecast operations in concern.

Output : 74.

10) Does the output remain same or different for both cases?
1)

1.   char l ='k';

2.   float b = 19.0f;

3.   int c;

4.   c = (l / convert.ToInt32(b));

5.   Console.Writeline(c);

2)

1.    char l ='k';

2.    float b = 19.0f;

3.    int c;

4.    c = Convert.ToInt32(l / b);

5.    console.writeline(c);

a) Yes
b) No

Answer : No

Output – 1) 5.
2) 6.

11. Default Type of number without decimal is ?

a) Long Int
b) Unsigned Long
c) Int
d) Unsigned Int

Answer : c

12. Correct output for code is?

1.  static void Main(string[] args)

2.  {

3.      float a = 10.553f;

4.      long b = 12L;

5.      int  c;

6.      c = Convert.ToInt32(a + b);

7.      Console.WriteLine(c);

8.  }

a) 23.453
b) 22
c) 23
d) 22.453

Answer : c

Explanation:The two datatype ‘float’ and ‘long’ after arithmetic operation completely converted to nearest whole number 23.