C # Tutorial1

Tutorial I 1. Find errors, if any in the following classdefinitions: a) Class Vector (int x,y}; Ans: Opening braces { is not given b) Class ABC { public int x; protected private y; } Ans: Datatype is not specified for y. c) Class xyz { public const int x; public static int y; } Ans: Value for constant variable x is not specified. d) Class ABC { int x=1; int y=x+1; } Ans: No error in initialization e) Class ABC { static int x=1,y,z=2; new double p=2.5; } Ans: Error access modifier cannot be new 2.What is wrong with the following code?If it is correct,what does it produce? Class A { static bool b1; int m1; public static void Main() {

A a=new A(); Console.WriteLine(“b1=”+b1); Console.WriteLine(m1=”+m1); } } Ans: The class variables should only accessed with instance of class. 3Find errors in the following class definition. Class alpha { int x; static int y; static void F() { x=10; y=20; } Static a1=new Alpha(); { a1.x=100; a1.y=200; Alpha.x=0; Alpha.y=0; . ………….. …………… } } Ans: Static variables are aways accessed using the class name and not the objects. 4.What is wrong with the following code? Class xy { int x=0; int y=x+1; } Ans: Error in initialization. 5.What would be the output of the following code? Class AB { int x=0;

public Void F() { int x=10; Console.WriteLine(x); } } Ans: since X is not public to class AB Method F() uses only value in it. 6.Comment on the following code: Class AB { private int number; public int number; { get{return number;} /* get property defines get accessor method */ } public int number { set{number=value;} /* set property defines set accessor method */ } } 7.Consider the following code:Will it compile?If not,why? Class product { public static void Main() { int x=10,y=20; Console.WriteLine(mul(x,y)); } int mul( int a,int b) //if this is having access modifier as public,this method will be invoked in main () function { return(a*b); } } 8.Will the following code compile?If no,why? Class A { public static void Main()

{ Test t; T.print(); } } Class Test // This class should be specified as public .also it will be error { public void print() {} } 9.Create a class named integer to hold two integer values. Design a method swap that could take two integer objects as parameters and swap their contents. Write a main program to implement the class integer and the method swap. using System; Class Integer { public int a; public int b; public int temp; public void swap(int x,int y) { a=x; b=y; temp=a; a=b; b=temp; } public static void Main() { integer i =new Integer(); int a=100; int b=200; I.swap(a,b); Console.WriteLine(“After swapping:”); Console.Writeline(“a=+a); Console.WriteLine(“b=”+b); } } Ans: After swapping: a=200 b=100