How do you round to 2 decimal places in Ruby?

Posted on by Muna Meyer

How do you round to 2 decimal places in Ruby?

round() with no argument will round to 0 decimals, which will return an integer type number. Using round(1) will round to one decimal, and round(2) will round to two decimals.

How do you fix 2 decimal places?

Rounding to decimal places

  1. look at the first digit after the decimal point if rounding to one decimal place or the second digit for two decimal places.
  2. draw a vertical line to the right of the place value digit that is required.
  3. look at the next digit.
  4. if it’s 5 or more, increase the previous digit by one.

What is TO_F in Ruby?

The to_f function in Ruby converts the value of the number as a float. If it does not fit in float, then it returns infinity. Syntax: number.to_f. Parameter: The function takes the integer which is to be converted to float. Return Value: The function returns the float value of the number.

What does .round do in Ruby?

The round() is an inbuilt method in Ruby returns a number rounded to a number nearest to the given number with a precision of the given number of digits after the decimal point. In case the number of digits is not given, the default value is taken to be zero.

What is Floor in Ruby?

The floor() is an inbuilt method in Ruby returns a number less than or equal to the given number with a precision of the given number of digits after the decimal point. In case the number of digits is not given, the default value is taken to be zero. Syntax: num.floor(ndigits)

How do you round off a float in Ruby?

round() is a float class method which return a float value rounded to the nearest value with n digits decimal digits precision.

  1. Syntax: float.round()
  2. Parameter: float value as argument.
  3. Return: Float value rounded to nearest precision. If precision is -ve : integer with at least ndigits.abs trailing zeros.

How do you know how many decimal places to use?

An analogous rule for percentages might be to use enough decimal places to ensure two significant digits for the range of values across groups, eg, if the range is 10% or more use whole numbers, if less than 1% use two decimal places, and otherwise one.