For Loop Statements - C# Questions & Answers

This section of our 1000+ C# multiple choice questions focuses on for loop statements in C# Programming Language.

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

```
 static void Main(string[] args)
```
```
 {
```
```
     int i;
```
```
     for (i = 0;  ; )
```
```
     {
```
```
         Console.WriteLine("hello");
```
```
     }
```
```
     Console.ReadLine();
```
```
 }
```

a) No output
b) hello
c) hello printed infinite times
d) Code will give error as expression syntax
View Answer

Answer: c
Explanation: Testing condition for the loop is absent. So, loop will continue executing.
Output :

         hello
         hello
         hello
         .
         .
         .

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

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```
  static void Main(string[] args)
```
```
  {
```
```
      float f;
```
```
      for (f = 0.1f; f <= 0.5; f += 1)
```
```
      Console.WriteLine( ++f );
```
```
      Console.ReadLine();
```
```
  }
```

a) 1.1
b) 0.1
c) 0.1 0.2 0.3 0.4 0.5
d) None of the mentioned
View Answer

Answer: a
Explanation: f = 0.1 and ++f = 0.1+1 = 1.1. So, 1.1>0.5, Condition fails and hence loop terminates.
Output :

1.1

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

```
 static void Main(string[] args)
```
```
 {
```
```
     int I, X;
```
```
     for (I = 1; I <= (9 % 2 + I); I++)
```
```
     {
```
```
         X = (I * 3 + I * 2) / I;
```
```
         Console.WriteLine(X);
```
```
     }
```
```
     Console.ReadLine();
```
```
 }
```

a) Output of code is 5 10
b) Output is 5 5 5 5
c) Print 5 infinite times
d) None of the mentioned
View Answer

Answer: c
Explanation: Testing condition is always incremented i.e i never ‘>’ (9%2+I). So, loop will never terminate.
Output :

 5 5 5.....

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

```
 static void Main(string[] args)
```
```
 {
```
```
     int I, J = 0;
```
```
     for (I = 1; I < 10; ) ;
```
```
     {
```
```
         J = J + I;
```
```
         I += 2;
```
```
     }
```

     Console.WriteLine("Sum of first 10 even numbers is:"+J);

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

a) 1 2 3 4 5 6 7 8 9
b) 25
c) 1
d) Run time error
View Answer

Answer: d
Explanation: Due to presence of ‘;’ after for()loop condition do not work as according to the statement. Remove the ‘;’.
Output :

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

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

      for (; Convert.ToBoolean(Convert.ToInt32(i)); Console.WriteLine(i--)) ;

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

a) 4 3 2 1
b) 3 2 1
c) 5 4 3 2 1
d) 2 1
View Answer

Answer: c
Explanation: Since, i = 5 and test condition is executed until i!=0. So, i– decrements value of i till condition is satisfied.
Output:

 5 4 3 2 1

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

```
 static void Main(string[] args)
```
```
 {
```
```
     int i, s = 0;
```

     for (i = 1; i <= 10; s = s + i, i++);

```
     {
```
```
         Console.WriteLine(s);
```
```
     }
```
```
     Console.ReadLine();
```
```
 }
```

a) Code report error
b) Code runs in infinite loop condition
c) Code gives output as 0 1 3 6 10 15 21 28 36 45
d) Code give output as 55
View Answer

Answer: d
Explanation: Since occurrence of termination symbol(;) at end of for loop.
Output:

7. Which statement is correct among the mentioned statements?
i. The for loop works faster than a while loop
ii. for( ; ; )implements an infinite loop
a) Only i is correct
b) Only ii is correct
c) Both i and ii are correct
d) Both i and ii are incorrect
View Answer

Answer: b
Explanation: By definition.

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

```
  {
```
```
      int i;
```
```
      Console.WriteLine("Hi");
```
```
      for (i = 1; i <= 10; i++)
```
```
          Program.Main(args);
```
```
      Console.ReadLine();
```
```
  }
```

a) Prints ‘Hi’ for one time
b) Prints ‘Hi’ for infinite times
c) Stack overflow exception Condition generated
d) None of the mentioned
View Answer

Answer: c
Explanation: Occurrence of ‘main()’ condition after for loop.
Output:

        Hi
        Hi
         .
         .
        stack overflow exception.

9. Which of the C# code should be added to get the following output?

```
    * * * * *
```
```
    * * * *
```
```
    * * *
```
```
    * *
```
```
    *
```
```
   static void Main(string[] args)
```
```
   {
```
```
       int i,j;
```
```
     /* Add code here */
```
```
 
```
```
  }
```

   for (i = 0;i &lt;= 4; i++)
   {
        for(j = 0;j &lt;= 4; j++)
        console.WriteLine("*");
        console.WriteLine("\n");
    }

   for (i = 0;i &lt;= 4; i++)
   {
        for(j = 4;j &lt;= i; j--)
        console.WriteLine("*");
        console.WriteLine("\n");
   }

   for (i = 0;i &lt;= 4; i++)
   {
        for (j = i;j &lt;= 4; j++)
        console.WriteLine("*");
        console.WriteLine("\n");
    }

   for ( i = 0;i &lt;= 4; i++)
   {
        for (j = 0;j &lt;= i; j++)
        console.WriteLine("*");
        console.WriteLine("\n");
    }

View Answer

Answer: c
Explanation: Input in Console and run the code.

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

```
   static void Main(string[] args)
```
```
   {
```
```
       int i;
```
```
       for (i =-3; i <= 3; i++)
```
```
       {
```
```
           switch (i)
```
```
           {
```
```
           case 0:
```

               Console.WriteLine("zero");

```
               break;
```
```
           }
```
```
           if (i > 0)
```
```
               Console.WriteLine("A");
```
```
           else if (i < 0)
```
```
               Console.WriteLine("B");
```
```
       }
```
```
       Console.ReadLine();
```
```
   }
```

a) B B zero A A A
b) B zero A A A
c) B B B zero A A A
d) A A A zero B B B
View Answer

Answer: c
Explanation: for i = -3, -2, -1 statement executed as B. for i = 0, it is zero and for i = 1, 2, 3 again statement printed as A separately for each value of i.
Output:

B B B zero A A A

11. Which of the following is not infinite loop?
a) for( ;’0′; )
b) for( ;’0′; )
c) for( ;’1′; )
d) for( ;’1′; )
View Answer

Answer: b
Explanation: None.

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

```
  static void Main(string[] args)
```
```
  {
```
```
      int i, j;
```

      for (i = 1, j = i; i <= 3 && j >= 0; i++, j--)

```
      {
```
```
          if (i == j)
```
```
              continue;
```
```
          else
```
```
              Console.WriteLine(j);
```
```
      }
```
```
      Console.ReadLine();
```
```
  }
```

a) i = 0, j = 1;
b) i = 1, j = 0;
c) j = 0;
d) None of the mentioned
View Answer

Answer: c
Explanation: Since for i = 1, j = 1 and 1 <= 3 also 1 >= 0 we had i == j. But after i++ and j–. The initial value of ‘j’ which is ‘0’ as j– preferred other than value of ‘j’ in i = j.
Output:

j = 0

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

```
 static void Main(string[] args)
```
```
 {
```
```
     int i = -10;
```

     for ( ;Convert.ToBoolean(Convert.ToInt32(i)) ;Console.WriteLine(i++)) ;

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

a) -9 -8 -7 -6 -5 -4 -3 -2 -1
b) -10 -9 -8 -7 -6 -5 -4 -3 -2
c) -10 -9 -8 -7 -6 -5 -4 -3 -2 -1
d) -8 -7 -6 -5 -4 -3 -2 -1
View Answer

Answer: c
Explanation: For first value of i = -10. Condition is executed until i!=0.
Output:

-10 -9 -8 -7 -6 -5 -4 -3 -2 -1

Sanfoundry Global Education & Learning Series – C# Programming Language.

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