C# Questions & Answers on Method Overloading for Freshers

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1. The process of defining two or more methods within the same class that have same name but different parameters list?

a) Method overloading
b) Method overriding
c) Encapsulation
d) None of the mentioned
Answer: a

Explanation: Two or more methods can have same name as long as their parameters declaration and definitions are different, the methods are said to be overloaded and the process is called method overloading. Method overloading is used when methods are required to perform similar tasks using different input parameters.
2. Which of these can be overloaded?

a) Constructors
b) Methods
c) Both Constructors & Methods
d) None of the mentioned
Answer: c
3. What could be the output of the following set of code?
  1.  class Program
  2.  {
  3.      static void Main(string[] args)
  4.      {
  5.          Console.WriteLine( vol(10));
  6.          Console.WriteLine( vol(2.5f,  5));
  7.          Console.WriteLine( vol( 5l,  4,  5));
  8.          Console.ReadLine();
  9.      }
  10.      static int vol(int x)
  11.      {
  12.          return(x * x * x);
  13.      }
  14.      static float vol(float r,  int h)
  15.      {
  16.          return(3.14f * r * r * h);
  17.      }
  18.      static long vol(long l, int b, int h)
  19.      {
  20.          return(l * b * h);
  21.      }
  22.  }
a) 1000
0
100
b) 0
0
100
c) compile time error
d) 1000
98.125
100
Answer: d

Explanation: The concept of method overloading is implemented in method “vol” with same name but different definitions and parameter list which is overloaded three times and each time the return type is different for each method and hence matches the method using types of parameters .
Output: 1000
98.125
100
4. What could be the output for the set of code?
  1.   class overload
  2.   {
  3.       public int x;
  4.       int y;
  5.       public int add(int a)
  6.       {
  7.           x = a + 1;
  8.           return x;
  9.       }
  10.       public int add(int a, int b)
  11.       {
  12.           x = a + 2;
  13.           return x;
  14.       }
  15.   }    
  16.   class Program
  17.   {
  18.       static void Main(string[] args)
  19.       {
  20.           overload obj = new overload();
  21.           overload obj1 = new overload();
  22.           int a = 0;
  23.           obj.add(6);
  24.           obj1.add(6, 2);
  25.           Console.WriteLine(obj.x);
  26.           Console.WriteLine(obj1.x);
  27.           Console.ReadLine();
  28.       }
  29.   }
a) 8
8
b) 0
2
c) 8
10
d) 7
8
Answer: d
Output: 7, 8
5. What will be the output for the set of code?
  1.  static void Main(string[] args)
  2.  {
  3.      int i = 5;
  4.      int j  = 6;
  5.      add(ref i);
  6.      add(6);
  7.      Console.WriteLine(i);
  8.      Console.ReadLine();
  9.  }
  10.  static void add(ref int x)
  11.  {
  12.      x = x * x;
  13.  }
  14.  static void add(int x)
  15.  {
  16.      Console.WriteLine(x * x * x);
  17.  }
a) Compile time error
b) 25
0
c) 216
0
d) 216
25
Answer: d
Output: 216
25
6. What would be output for the set of code?
  1.  class maths
  2.  {
  3.      public int x;
  4.      public double y;
  5.      public int add(int a, int b)
  6.      {
  7.          x = a + b;
  8.          return x;
  9.      }
  10.      public int add(double c, double d)
  11.      {
  12.          y = c + d;
  13.          return (int)y;
  14.      }
  15.      public maths()
  16.      {
  17.          this.x = 0;
  18.          this.y = 0;
  19.      }
  20.  }    
  21. class Program
  22. {
  23.     static void Main(string[] args)
  24.     {
  25.         maths obj = new maths();
  26.         int a = 4;
  27.         double b = 3.5;
  28.         obj.add(a, a);
  29.         obj.add(b, b);
  30.         Console.WriteLine(obj.x + " " + obj.y);
  31.         Console.ReadLine();
  32.     }
  33. }
a) 4, 3.5
b) 8, 0
c) 7.5, 8
d) 8, 7
Answer: d
Output: 8, 7
7. What will be output for the given set of code?
  1.  class maths
  2.  {
  3.      public static void fun1()
  4.      {
  5.          Console.WriteLine("method 1 :");
  6.      }
  7.      public void fun2()
  8.      {
  9.          fun1();
  10.          Console.WriteLine("method 2 :");
  11.      }
  12.      public void fun2(int k)
  13.      {
  14.          Console.WriteLine(k);
  15.          fun2();
  16.      }
  17.  }    
  18.  class Program
  19.  {
  20.      static void Main(string[] args)
  21.      {
  22.          maths obj = new maths();
  23.          maths.fun1();
  24.          obj.fun2(20);
  25.          Console.ReadLine();
  26.      }
  27.  }
a) method 1:
method 2:
20
method 1:
b) method 2:
20
method 1:
method 1:
c) method 1:
0
method 2:
method 2:
d) method 1:
20
method 1:
method 2:
Answer: d
Explanation: None.
Output : method 1:
20
method 1:
method 2:
8. What is the process of defining a method in terms of itself, that is a method that calls itself?

a) Polymorphism
b) Abstraction
c) Encapsulation
d) Recursion
Answer: d
9. What will be the output for the following set of code?
  1.  class maths
  2.  {
  3.      public int fun1(int k)
  4.      {
  5.          k = 20;
  6.          return k;
  7.      }
  8.      public Single fun1(float t)
  9.      {
  10.          t = 3.4f;
  11.          return t;
  12.      }
  13.  }  
  14.  class Program
  15.  {
  16.      static void Main(string[] args)
  17.      {
  18.          maths obj = new maths();
  19.          int i;
  20.          i = obj.fun1(30);
  21.          Console.WriteLine(i);
  22.          Single j;
  23.          j = obj.fun1(2.5f);
  24.          Console.WriteLine(j);
  25.          Console.ReadLine();
  26.      }
  27.  }
a) 30
2.5f
b) 2.5f
30
c) 20
2.5f
d) 20
3.4f
Answer: d
Output: 20
3.4f
10. What will be the output for the given set of code?
  1.  class maths
  2.  {
  3.      public int fun(int k, int y)
  4.      {
  5.          return k + y;
  6.      }
  7.      public int fun1(int t, float z)
  8.      {
  9.          return (t+(int)z);
  10.      }
  11.  }    
  12.  class Program
  13.  {
  14.      static void Main(string[] args)
  15.      {
  16.          maths obj = new maths();
  17.          int i;
  18.          int b = 90;
  19.          int c = 100;
  20.          int d = 12;
  21.          float l = 14.78f;
  22.          i = obj.fun(b, c);
  23.          Console.WriteLine(i);
  24.          int j = (obj.fun1(d,  l));
  25.          Console.WriteLine(j);
  26.          Console.ReadLine();
  27.      }
  28.  }
a) 190, 26.78f
b) 0, 26.78f
c) 190, 26
d) 190, 0
Answer: c
Output: 190
26
11. What will be the output for the set of code?
  1.  class maths
  2.  {
  3.      public int fun(int k, int y, int n)
  4.      {
  5.          Console.WriteLine(k + "  " + y + "  " + n);
  6.          return (k);
  7.      }
  8.      public int fun1(int t,float z)
  9.      {
  10.          Console.WriteLine(t + "  " + z);
  11.          return t;
  12.      }
  13.  }    
  14.  class Program
  15.  {
  16.      static void Main(string[] args)
  17.      {
  18.          maths obj = new maths();
  19.          int b = 90;
  20.          int c = 100;
  21.          int d ;
  22.          float l;
  23.          int i = obj.fun(b, c, 12);
  24.          int j = (obj.fun1(12, 14.78f));
  25.          Console.ReadLine();
  26.      }
  27.  }
a) 0, 0, 0
12, 14.78
b) 0, 0, 0
0, 0
c) 90, 100, 12
12, 14
d) 90, 100, 12
12, 14.78
Answer: d
Output: 90, 100, 12
12, 14.78
12. What will be the output for the given set of code?
  1.  class maths
  2.  {
  3.      public int fun(int ii)
  4.      {
  5.          return(ii > 0 ? ii :ii * -1);
  6.      }
  7.      public long fun(long ll)
  8.      {
  9.          return(ll > 0 ? ll :ll * -1);
  10.      }
  11.      public double fun( double dd)
  12.      {
  13.          return(dd > 0 ? dd :dd * -1);
  14.      }
  15.  }    
  16.  class Program
  17.  {
  18.      static void Main(string[] args)
  19.      {
  20.          maths obj = new maths();
  21.          int i = -25;
  22.          int j ;
  23.          long l = -100000l ;
  24.          long m;
  25.          double d = -12.34;
  26.          double e;
  27.          j = obj.fun(i);
  28.          m = obj.fun(l);
  29.          e = obj.fun(d);
  30.          Console.WriteLine(j + "  " + m + "  " + e);
  31.          Console.ReadLine();
  32.      }
  33.  }
a) 1 1 1
b) 0 0 0
c) 25 100000 12.34
d) -25 -100000 -12.34
Answer: c
Output: 25 100000 12.34
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