Csharp Interview Questions :: Expression Type Conversion :: Basic

• Expression Type Conversion - Basic

Select the correct statement about the C#.NET code given below?

class Trial
{
int i;
float d;
}

struct Sample
{
private int a;
private Single b;
private Trial t;
}

Sample s = new Sample();

Answer:

Explanation:

Select the correct statement about the C#.NET code given below?

struct Person
{
private String name;
private int age;
private string pin_code;
}
Person p = new Person();

Answer:

Explanation:

Which of the conversions are valid for the given set of code?

static void Main(string[] args)
{
int a = 20;
long b = 40;
double c = 1.789;
b = a;
c = a;
a = b;
b = c;
}

Answer:

Explanation:

Conversion of data type from ‘int’ to long and double are implicit in nature, as 'long' and 'double' are subset of int. So b = a and c = a are valid. In case of a = b and b = c needs explicit conversion. 

Correct solution

static void Main(string[] args)
{
int a = 20;
long b = 40;
double c = 1.789;
b = a;
c = a;
a = (int)b;
b = (long)c;
}

Which implicit datatype conversion is not possible by the compiler?

Answer:

Explanation:

‘int’ datatype is 32 bit signed integer whereas ‘uint’ datatype is 32 bit unsigned integer. Since, the range of int is larger than that of uint, the compiler cannot implicitily convert from larger datatype to smaller datatype.

Select the subset of 'int' datatype from the following options:

Answer:

Explanation:

• Expression Type Conversion - Basic