1. What happens when you compile and run the
below program?
public class Program
{
public static void Main(string[] args)
{
Console.WriteLine(Math.Round(6.5));
Console.WriteLine(Math.Round(9.5));
}
}
Output:
6
10
10
2. Predict the output for below program.
public class Program
{
public static void Main(string[] args)
{
varintArray = new int[] { 1, 2, 3, 4, 5 };
vardoubleArray =
intArray.Cast<double>().ToList();
for (int i = 0; i <doubleArray.Count;
i++)
Console.WriteLine(doubleArray[i]);
}
}
Output:
InvalidCastException
exception at runtime.Cast is defined as an
extension method on the non-generic IEnumerable type instead of IEnumerable. As
enumerating an IEnumerable enumerates on object types, and casting from object
to double is not permitted.
3. What will be the output for below program?
public class Program
{
public static void Main(string[] args)
{
byte b = 100;
dynamic d = b;
Console.WriteLine(d.GetType());
d += 100;
Console.WriteLine(d.GetType());
}
}
Output:
System.Byte
System.Int32
System.Int32
4. Predict the output for below Program
public class Program
{
public static void Main(string[] args)
{
var actions = new List<Action>();
for (int i = 0; i < 4; i++)
actions.Add(() =>Console.WriteLine(i));
foreach (var action in actions)
action();
}
}
Output:
4
4
4
4
4
4
4
5. What will be the output for below program
in release mode and how different is it from debug mode?
public class Program
{
public
static void Main(string[] args)
{
boolisComplete = false;
var t = new Thread(() =>
{
int i = 0;
while (!isComplete) i += 0;
});
t.Start();
Thread.Sleep(500);
isComplete = true;
t.Join();
Console.WriteLine("complete!");
}
}
Output:
The
program will hung in release mode and will give an output in debug mode.
complete!
complete!
6. Predict the output for below Program.
public class Program
{
public static void Main()
{
var list = new List<int> { 10, 20,
30, 40, 50 };
var collection = new
Collection<int>(list);
list.Add(60);
Console.WriteLine(String.Join(",",
collection));
}
}
Output:
10,20,30,40,50,60
7. What will be the output for below program?
public class Program
{
public static void Main()
{
Nullable<int>nullableVariable = 0;
intintVariable = 1;
Console.WriteLine(nullableVariable.GetType()
== intVariable.GetType());
}
}
Output:
True
8. Predict the Output for below program
public class Program
{
public static void Main()
{
class1 a = new class3();
Console.WriteLine(a.DoSomething());
}
public class class1
{
public virtual string DoSomething()
{
return "class1";
}
}
public class class2 : class1
{
public override string DoSomething()
{
return "class2";
}
}
public class class3 : class2
{
public new string DoSomething()
{
return "Class3";
}
}
}
Output:
class2
9. What will be the output for below program?
public class Program
{
public static void Main()
{
int? i = null;
i++;
Console.WriteLine("Value of i is {0}
", i);
}
}
Output:
Value
of i is
10. Predict the output for below program?
public class Program
{
public static void Main()
{
doubledVal = 100.1;
Console.WriteLine((int)dVal);
objectobjVal = dVal;
Console.WriteLine((int)objVal);
}
}
Output:
100
Unhandled Expecption:
System.InvalidCastException: Specified cast is not valid.
atProgram.Main()
Unhandled Expecption:
System.InvalidCastException: Specified cast is not valid.
atProgram.Main()
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