IF Statements - C# Questions & Answers

This section of our 1000+ C# multiple choice questions focuses on relational and logical operators in C# Programming Language.

1. What will be the output of the following C# code?

```
 static void Main(string[] args)
```
```
 {
```
```
     int i = 30;
```
```
     int j = 25 % 25;
```

     if (Convert.ToBoolean(Convert.ToInt32(i = j)))

```
     {
```
```
         Console.WriteLine("In if");
```
```
     }
```
```
     else
```
```
     {
```
```
         Console.WriteLine("In else");
```
```
     }
```
```
     Console.WriteLine("In main");
```
```
     Console.ReadLine();
```
```
 }
```

a) In if
b) In else
c)

In if
In main

In else
In main

View Answer

Answer: d
Explanation: Usage of ‘=’ operator instead of ‘==’ operator. Hence, the condition is not true.
Output:

         In else
         In main

2. What will be the output of the following C# code?

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```
 static void Main(string[] args)
```
```
 {
```
```
     int i;
```
```
     int b = 8, a = 32;
```
```
     for (i = 0; i <= 10; i++)
```
```
     {
```
```
         if ((a / b * 2)== 2)
```
```
         {
```

             Console.WriteLine( i + " ");

```
             continue;
```
```
         }
```
```
         else if (i != 4)
```
```
             Console.Write(i + " ");
```
```
         else
```
```
             break;
```
```
    }
```
```
    Console.ReadLine();
```
```
 }
```

a) 1 2 3 4 5 6 7 8 9
b) 0 1 2 3 4 5 6 7 8
c) 0 1 2 3
d) 0 1 2 3 4
View Answer

Answer: c
Explanation: The if condition will never be fulfilled as ((a / b) * 2 == 2) is never true. Hence, only else part of condition will be executed until i! = 4 i.e i = 0, 1, 2, 3.
Output:

0 1 2 3

3. Which of the following conditions are true in the following C# code?

```
 static void Main(string[] args)
```
```
 {
```

     Console.WriteLine("Enter a letter:");

```
     char c = (char)Console.Read();
```
```
     if (Char.IsDigit(c) == true)
```
```
         Console.WriteLine("A number");
```
```
     else if (char.IsLower(c) == true)
```

         Console.WriteLine("A lowercase letter");

```
     else if (char.IsUpper(c) == true)
```

         Console.WriteLine("An uppercase letter");

```
     Console.ReadLine();
```
```
 }
```
```
 a. Enter a letter :
```
```
    a
```
```
    An uppercase letter
```
```
 b. Enter a letter :
```
```
    A
```
```
    An uppercase letter
```
```
 c. Enter a letter :
```
```
    2
```
```
    A number
```
```
 d. Enter a letter :
```
```
    2
```
```
    A lowercase letter.
```

a) a, b, c
b) b, c, d
c) a, d, b
d) b, c
View Answer

Answer: d
Explanation: None.
Output:

                    Enter a letter :
                          A
                          An uppercase letter
                          Enter a letter :
                          2
                          A number

4. What will be the output of the following C# code?

```
  static void Main(string[] args)
```
```
  {
```
```
      int i, j;
```
```
      for (i = 2; i >= 0; i--)
```
```
      {
```
```
          for (j = 0; j <= 2; j++)
```
```
          {
```
```
              if (i == j)
```
```
              {
```

                  Console.WriteLine("1");

```
              }
```
```
              else
```
```
              {
```

                  Console.WriteLine("0");

```
              }
```
```
         }
```
```
         Console.WriteLine("\n");
```
```
         Console.ReadLine();
```
```
      }
```
```
  }
```

   1 0 0
   0 1 0
   0 0 1

   0 1 0
   1 0 0
   0 0 1

   0 0 1
   0 1 0
   1 0 0

   1 0 0
   0 0 1
   0 1 0

View Answer

Answer: c
Explanation: In first row for i = 2 : j = 0 == 0 as if condition fails for (i == j)
i = 2 : j = 1 == 0 as again if condition fails for ( i == j)
i = 2 : j = 2 == 1 as (i == j).
In Second row for i = 1 : j = 0 == 0 as if condition fails for (i == j)
i = 1 : j = 1 == 1 (as i==j)
i = 1 : j = 2 == 0 as (i==j) not true
In Third row for i = 0 : j = 0 == 1 as (i==j) true
i = 0 : j = 1 == 0 as (i==j) not true.
i = 0 : j = 2 == 0 .
So, 0 0 1
0 1 0
1 0 0

Output: 0 0 1
0 1 0
1 0 0

5. Select the correct ‘if statement’ to be filled in the following C# code?

```
 static void Main(string[] args)
```
```
 {
```

     int []num = {50, 65, 56, 88, 43, 52};

```
     int even = 0, odd = 0;
```

     for (int i = 0 ;i < num.Length ;i++)

```
     {
```

          /*___________________________*/

```
     }   
```

     Console.WriteLine("Even Numbers:" +even);

     Console.WriteLine("Odd Numbers:" +odd);

```
     Console.ReadLine();
```
```
 }
```

```
   if ((num % 2) == 0)
```
```
   {
```
```
       even += 1;
```
```
   }
```
```
   else
```
```
   {
```
```
       odd += 1;
```
```
   }
```

```
   if((num * i) == 0)
```
```
   {
```
```
       even += 1;
```
```
   }
```
```
   else
```
```
   {
```
```
       odd += 1;
```
```
   }
```

```
   if(num[i] % 2 == 0)
```
```
    {
```
```
        even += 1;
```
```
    }
```
```
    else
```
```
    {
```
```
        odd += 1;
```
```
    }
```

```
   if(num[i] % 2 = 0)
```
```
    {
```
```
        even += 1;
```
```
    }
```
```
    else
```
```
    {
```
```
        odd += 1;
```
```
    }
```

View Answer

Answer: c
Explanation:

                int []num = {50, 65, 56, 88, 43, 52};
                int even = 0,odd = 0;
                for (int i = 0 ;i &lt; num.Length ;i++)
                {
                    if (num[i] % 2 == 0)
                    {
                    even += 1;
                    }
                    else
                    {
                    odd += 1;
                    }
                }   
                Console.WriteLine("Even Numbers: " +even);
                Console.WriteLine("Odd Numbers: " +odd);
                Console.ReadLine();

6. What will be the output of the following C# code?

```
 static void Main(string[] args)
```
```
 {
```
```
     int a = 15, b = 10, c = 1;
```

     if (Convert.ToBoolean(a) && (b > c))

```
     {
```

         Console.WriteLine("cquestionbank");

```
     }
```
```
     else
```
```
     {
```
```
         break;
```
```
     }
```
```
 }
```

a) cquestionbank
b) It will print nothing
c) Compile time error
d) Run time error
View Answer

Answer: c
Explanation: Keyword “break” is not part of if-else statement. This keyword is used in case of loop or switch case statement.

7. What will be the output of the following C# code?

```
  static void Main(string[] args)
```
```
  {  
```
```
      int a = 5;
```

      if (Convert.ToBoolean((.002f) -(0.1f)))

      Console.WriteLine("Sachin Tendulkar");

```
      else if (a == 5)
```

      Console.WriteLine("Rahul Dravid");

```
      else
```
```
      Console.WriteLine("Ms Dhoni");
```
```
      Console.ReadLine();
```
```
  }
```

a) Rahul Dravid
b) Sachin Tendulkar
c) Ms Dhoni
d) Warning : Unreachable Code
View Answer

Answer: b
Explanation: (0.002 – 0.1f) not equivalent to zero hence it is true. So, only first if clause will execute and print:Sachin Tendulkar on console. As, first condition is always true so no else if statement will be executed.
Output:

 Sachin Tendulkar

8. What will be the output of the following C# code?

```
  static void Main(string[] args)
```
```
  {   
```
```
      int a = -1;
```
```
      int b = -1;
```

      if (Convert.ToBoolean (++a = ++b))

```
      Console.WriteLine("a");
```
```
      else
```
```
      Console.WriteLine("b");
```
```
      Console.ReadLine();
```
```
  }
```

a) a
b) b
c) Compile time error
d) Code execute successfully with no output
View Answer

Answer: c
Explanation: Both a and b are constants. Illegal to assign a value to constant on left hand of ‘=’operator. Hence, it must be some variable.

9. What will be the output of the following C# code?

```
  static void Main(string[] args)
```
```
  {
```
```
      int a = 5, b = 10;
```

      if (Convert.ToBoolean(Convert.ToInt32(0xB)))

      if (Convert.ToBoolean(Convert.ToInt32(022)))

      if (Convert.ToBoolean(Convert.ToInt32('\xeb')))

```
      Console.WriteLine("java");
```
```
      else ;
```
```
      else ;
```
```
      else ;
```
```
  }
```

a) Compile time error: Misplaced else
b) Compile time error: Undefined symbol
c) java
d) Warning: Condition is always true
View Answer

Answer: c
Explanation:

                  oxB: hexadecimal integer constant.
                  022: It octal integer constant.
                 ‘\xeb’: It is hexadecimal character constant.

As zero is false and any non-zero number is true. All, constants return a non-zero value. So, all if conditions in the above program are true.
Output:

 java.

10. What will be the output of the following C# code?

```
 static void Main(string[] args)
```
```
 {
```
```
     int a = 5, b = 10;
```

     if (Convert.ToBoolean(Convert.ToInt32(++a)) || Convert.ToBoolean(Convert.ToInt32(++b)))

```
     {
```

         Console.WriteLine(a + "\n" + b);

```
     }
```
```
     else
```
```
     Console.WriteLine(" C# ");
```
```
 }
```

a) 6 11
b) 6 16
c) 6 12
d) 6 10
View Answer

Answer: d
Explanation: Consider the following expression:( ++a || ++b). In this expression || is ‘Logical OR operator’. Two important properties of this operator are:
Property 1:
(Expression1) || (Expression2)
|| operator returns 0 if and only if both expressions return a zero otherwise || operator returns 1.
initial value of a is 5. So ++a will be 6. Since ++a is returning a non-zero so ++b will not execute.
Output :

 6 10.

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