gs gs108 Arrays and Strings - Use of Ref and Out Parameters - Quiz No.1
gs gs108 CSharp Quiz
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Question 2: Statements about ‘ref’ keyword used in C#.NET are?
The ref keyword causes arguments to be passed by reference
While using ‘ref’ keyword any changes made to the parameter in the method will be reflected in the variable when control is passed back to the calling method
Ref usage eliminates overhead of copying large data items
All of the mentioned
Question 3: What will be the output of the following C# code?
static void main(string[] args) { int n = 1; method(n); console.Writeline(n); method1(ref n); console.Writeline(n); } static void method(int num) { num += 20; console.writeline(num); } static void method1(ref int num) { num += 20; console.writeline(num); } 1 1 1 1 21 1 21 21 11 21 21 11 21 1 21 21
Question 4: Which method does following C# code explains?
static void Main(string[] args) { int a = 10, b = 20; method(ref a, ref b); console.writeline(a + " " + b); } static void swap(ref int i, ref int j) { int t; t = i; i = j; j = t; }
Call by reference
Call by value
Output parameter
parameter arrays
Question 5: What will be the output of the following C# code?
static void main(string[] args) { int []arr = new int[]{ 1, 2, 3, 4, 5}; fun (ref arr); for (int i = 0; i < arr.Length ; i++) Console.WriteLine( arr[i] + " "); } static void fun(ref int[]a) { a = new int[6]; a[3] = 32; a[1] = 24; }
0, 0, 32, 0, 0, 0
0, 24, 0, 32, 0, 0
24, 0, 32, 0, 0, 0
0, 0, 32, 0, 0, 0
Question 7: What will be the output of the following C# code?
static void Main(string[] args) { int a = 5; int b = 0, c = 0; method (a, ref b, ref c); Console.WriteLine(b + " " + c); Console.ReadLine(); } static int method(int x, int p, ref int k) { p = x + x * x; k = x * x + p; return 0; }
30, 55
55, 30
Compile time error
0, 0
Question 9: Select the correct match of parameter declaration.
static Void main(string[] args) { int a = 5; int b = 6; float c = 7.2f; math (ref a, ref b, ref c); Console.WriteLine(a + " " + b + " " + c); } static int math(/*add parameter declaration */) { a += b; b *= (int)c; c += a * b; return 0; }
ref int a, int b, ref float c
ref int a, ref float c, ref int b
ref int a, ref int b, float c
ref int a, ref int b, ref float c
Question 10: Which statement is/are correct?
An argument passed to a ref parameter need not be initialized first
Variables passed as out arguments need to be initialized prior to being passed
To use a ref parameter, only the calling method must explicitly use the ref keyword
None of the mentioned
