gs gs108 Delegates, Generics and LINQ - Operation and Query with LINQ - Quiz No.1
gs gs108 CSharp Quiz
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Question 1: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { string[] strs = {"alpha", "beta", "gamma"}; var chrs = from str in strs let chrArray = str.ToCharArray() from ch in chrArray orderby ch select ch; Console.WriteLine("The individual characters in sorted order:"); foreach (char c in chrs) Console.Write(c + " "); Console.WriteLine(); Console.ReadLine(); } }
a a l h a b g m m a p e t a
a a a a a b e g h l m m p t
a g h l m m p t a a a a b e
Run time error
Question 2: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; var posNums = nums.Where(n => n > 0).Select(r => r*2). OrderByDescending(r=>r); Console.Write("The positive values in nums: "); foreach(int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }
code run successfully prints nothing
run time error
code run successfully prints multiple of 2
compile time error
Question 3: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { int[] nums = {3, 1, 2, 5, 4}; var ltAvg = from n in nums let x = nums.Average() where n < x select n; Console.WriteLine("The average is " + nums.Average()); Console.ReadLine(); } }
Run time error
3
5
Compile time error
Question 4: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { Expression<Func<int, int, bool>> IsFactorExp = (n, d) => (d != 0) ? (n % d) == 0 : false; Func<int, int, bool> IsFactor = IsFactorExp.Compile(); if (IsFactor(10, 5)) Console.WriteLine("5 is a factor of 10."); if (!IsFactor(343, 7)) Console.WriteLine("7 is not a factor of 10."); Console.ReadLine(); } }
Compile time error
Run time error
5 is a factor of 10 7 is not a factor of 10
5 is a factor of 10
Question 5: Choose the namespace in which Expression trees are encapsulated?
System.Linq
System.Linq.Expressions
System.Text
System.Collections.Generic
Question 6: In the following C# code, which query will work according to the set of code?
class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; int len = /*_________________ */ Console.WriteLine("The number of positive values in nums: " + len); Console.ReadLine(); } } from n in nums where n > 0 select nfrom n in nums where n > 0 select n.Count()(from n in nums where n > 0 select n).Count();
Both "from n in nums where n > 0 select n.Count()" & "(from n in nums where n > 0 select n).Count();"
Question 7: In the following C# code, what does the output represent?
class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; var posNums = from n in nums where n > 0 select n; int len = posNums.Count(); Console.WriteLine(len); Console.ReadLine(); } }
Execution of code with nothing being printed
Execution of code with printing all numbers
Execution of code with counting total numbers greater than zero
Run time error
Question 8: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; var posNums = nums.Where(n => n < 10).Select(r => r%3); Console.Write("The values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }
Compile time error
Run time error
1 -2 0 0 -1 2
2 -1 0 0 -2 1
Question 9: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { string[] strs = { ".com", ".net", "facebook.com", "google.net", "test", "netflix.net", "hsNameD.com" }; var netAddrs = from addr in strs where addr.Length > 4 && addr.EndsWith(".net", StringComparison.Ordinal) select addr; foreach (var str in netAddrs) Console.WriteLine(str); Console.ReadLine(); } }
Compile time error
Run time error
facebook.com netflix.net google.net google.net netflix.net
Question 10: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { int[] nums = { 1, -2, -3, 5 }; var posNums = from n in nums orderby n descending select n*4 / 2; Console.Write("The values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }
10 2 -4 -6
5 1 -2 -3
1 5 -2 -3
Run time error
