Explore topic-wise MCQs in General Awareness.

1. Myclass class; Myclass class2 = null; 2. int i; int j = 0;

int a,b; a = (b = 10) + 5;

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(); } 

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

static void Main(string[] args) { int a = 5; int b = 10; int c; Console.WriteLine(c = a-- - ++b); Console.WriteLine(b); Console.ReadLine(); }

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(); } 

class ABC { static int m; int n; void fun (int x , ref int y, out int z, int[] a) { int j = 10; } } 

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(); }

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

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(); } } 

a. Region of code within which variable value is valid and hence can be accessed.
b. No, relation with region where variable is declared its value is valid in entire scope.

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

class Program { public static void Main(string[] args) { int i = 100; for (a = 0; a < 5; a++) { int i = 200; Console. WriteLine(a * i); } Console. ReadLine(); } } 

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

1. Memory allocated to Value type is from heap and reference type is from System. ValueType
2. Memory allocated to Value type is from System. ValueType and reference type is from Heap
3. 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

 public static void Main(string[] args) { int i = 123; object o = i; i = 456; System. Console. WriteLine("The value-type value = {0}", i); System. Console. WriteLine("The object-type value = {0}", o); Console. ReadLine(); }

 public static void Main(string[] args) { int i = 546; object o = i; int n =(int) o; o = 70; System. Console. WriteLine("The value-type value = {0}", n); System. Console. WriteLine("The object-type value = {0}", o); Console. ReadLine(); }

static void Main(string[] args) { int num1 = 20000; int num2 = 50000; long total; total = num1 + num2; Console.WriteLine("Total is : " +total); Console.ReadLine(); } 

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

 int i, j = 1, k; for (i = 0; i < 3; i++) { k = j++ - ++j; Console.Write(k + " "); }

static void Main(string[] args) { int b= 11; int c = 7; int r = 5; int e = 2; int l; int v = 109; int k; int z,t,p; z = b * c; t = b * b; p = b * r * 2; l = (b * c) + (r * e) + 10; k = v - 8; Console.WriteLine(Convert.ToString(Convert.ToChar(z)) + " " + Convert.ToString(Convert.ToChar(t)) + Convert.ToString(Convert.ToChar(p)) + Convert.ToString(Convert.ToChar(l)) + Convert.ToString(Convert.ToChar(v)) + Convert.ToString(Convert.ToChar(k))); Console.ReadLine(); } 

static void Main(string[] args) { int a , b; int c = 10; int d = 12; int e = 5; int f = 6; a = c * (d + e) / f + d; Console.WriteLine(a); b = c * ( d + e / f + d); Console.WriteLine(b); if (a < b) { Console.WriteLine(" parantheses changes values"); } else if (a > b) { Counterintelligence("they have same value"); } Console.ReadLine(); } 

 public static void Main(string[] args) { double ZERO = 0; Console.WriteLine("RESULT OF DIVISION BY ZERO IS :{0}", (0 / ZERO)); Console.ReadLine(); } 

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

static void Main(string[] args) { var days = "MTWTFSS"; var daysArray = days.ToCharArray().Cast().ToArray(); for (var i = 0; i < daysArray.Length; i++) { switch (daysArray[i]) { case "M": daysArray[i] = "Monday"; break; case "T": daysArray[i] = "Tuesday"; break; case "W": daysArray[i] = "Wednesday"; break; case "R": daysArray[i] = "Thursday"; break; case "F": daysArray[i] = "Friday"; break; case "S": daysArray[i] = "Saturday"; break; case "U": daysArray[i] = "Sunday"; break; } } daysArray[daysArray.Length - 1] = "and " + daysArray[daysArray.Length - 1]; Console.WriteLine(string.Join(", ", daysArray)); } 

static void Main(string[] args) { { var dayCode = "MTWFS"; var daysArray = new List(); var list = new Dictionary { {"M", "Monday"}, {"T", "Tuesday"}, {"W", "Wednesday"}, {"R", "Thursday"}, {"F", "Friday"}, {"S", "Saturday"}, {"U", "Sunday"} }; for (int i = 0,max = dayCode.Length; i < max; i++) { var tmp = dayCode[i].ToString(); if (list.ContainsKey(tmp)) { daysArray.Add(list[tmp]); } } Console.WriteLine(string.Join(" n ", daysArray)); } 

1. varchar is non unicode and char is unicode character datatype
2. char is n bytes whereas varchar is actual length in bytes of data entered in terms of storage size
3. varchar is variable in length and char is the fixed length string
4. For varchar, if a string is less than the maximum length then it is stored in verbatim without any extra characters while for char if a string is less than the set length it is padded with extra characters to equalize its length to given length

 class Program { static void Main(string[] args) { Uri obj = new Uri("https://www.mcqsmentor.com/Category/c-sharp-programming"); Console.WriteLine(obj.AbsoluteUri); Console.ReadLine(); } } 

 class MyClass { char[] chrs = { 'A', 'B', 'C', 'D' }; public System.Collections.IEnumerator GetEnumerator() { foreach (char ch in chrs) yield return ch; } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach (char ch in mc) Console.Write(ch + " "); Console.WriteLine(); Console.ReadLine(); } } 

 public System.Collections.IEnumerator GetEnumerator() { foreach (char ch in chrs) yield return ch; } 

 class MyClass { char chrs = 'A' ; public IEnumerator GetEnumerator() { for (int i = 20; i >=0; --i) yield return (char)((chrs + i)); } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach (char ch in mc) Console.Write(ch + " "); Console.WriteLine(); Console.ReadLine(); } } 

 class MyClass { char chrs = 'A' ; public IEnumerator GetEnumerator() { for (int i = 20; i >=0; --i) if (i == 10) yield break; yield return (char)((chrs + i)); } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach (char ch in mc) Console.Write(ch + " "); Console.WriteLine(); Console.ReadLine(); } } 

 class MyClass { int[] a = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}; public IEnumerator GetEnumerator() { for (int i = 0; i < 20; i++) { if (a[i] % 2 == 0) yield return (int)(a[i]); } } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach (int i in mc) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } } 

 class MyClass { char ch = 'A'; int e = 4; int k = 9; int z = 6; public IEnumerator GetEnumerator() { for (int i = 0; i < 26; i++) { if (i == e*k /z) yield break; yield return (int)(ch + i); } } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach(int ch in mc) Console.Write(ch + " "); Console.WriteLine(); Console.ReadLine(); } } 

public Thread(ThreadStart start)

 class A {} class B : A {} class CheckCast { static void Main() { A a = new A(); B b = new B(); b = a as B; b = null; if(b==null) Console.WriteLine("The cast in b = (B) a is NOT allowed."); else Console.WriteLine("The cast in b = (B) a is allowed"); } } 

MemberTypes MemberType

MethodInfo[] GetMethods()

Type[] GetGenericArguments()

object Invoke(object obj, object[] parameters)

public static WebRequest Create(string requestUriString)