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Home C Programming Floating Point Issues See What Others Are Saying!
  • Question
  • We want to round off x, a float, to an int value, The correct way to do is


  • Options
  • A. y = (int)(x + 0.5)
  • B. y = int(x + 0.5)
  • C. y = (int)x + 0.5
  • D. y = (int)((int)x + 0.5)

  • Correct Answer
  • y = (int)(x + 0.5) 

    Explanation
    Rounding off a value means replacing it by a nearest value that is approximately equal or smaller or greater to the given number.

    y = (int)(x + 0.5); here x is any float value. To roundoff, we have to typecast the value of x by using (int)

    Example:

    
    #include <stdio.h>
    
    int main ()
    {
      float x = 3.6;
      int y = (int)(x + 0.5);
      printf ("Result = %d\n", y );
      return 0;
    }
    

    Output:
    Result = 4.


    More questions

    • 1. Bitwise | can be used to set a bit in number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 2. Can we have an array of bit fields?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 3. By default structure variable will be of auto storage class

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 4. Bitwise can be used to reverse a sign of a number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 5. Is it necessary that in a function which accepts variable argument list there should be at least be one fixed argument?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 6. Bitwise can be used to generate a random number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 7. A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. Bitwise & can be used to check if more than one bit in a number is on.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. It is necessary that a header files should have a .h extension?

    • Options
    • A. Yes
    • B. No
    • Discuss


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