require 'bigdecimal'
require 'bigdecimal/util'
=begin
============================================================
Convert a decimal-like value to an Integer in Ruby.
This program demonstrates:
• Conversion using round, which rounds to the nearest integer.
• Conversion using to_i, which truncates toward zero.
• Conversion using BigDecimal for precise decimal arithmetic.
• A helper method that prints all conversion styles.
Notes:
• Ruby does not have a separate "long" type; Integer expands as needed.
• round returns an Integer.
• to_i removes the fractional part.
• BigDecimal#to_i also truncates.
============================================================
=end
# Rounds a Float to an Integer
def convert_decimal_to_integer(value)
value.round
end
# Truncates a Float to an Integer
def cast_decimal_to_integer(value)
value.to_i
end
# Converts BigDecimal using truncation
def convert_bigdecimal_to_integer(value)
value.to_i
end
# Prints both conversion styles for Float
def show_float_conversions(value)
puts "Input decimal (Float): #{value}"
rounded = convert_decimal_to_integer(value)
truncated = cast_decimal_to_integer(value)
puts "Rounded (round): #{rounded}"
puts "Truncated (to_i): #{truncated}"
puts
end
# Prints conversion styles for BigDecimal
def show_bigdecimal_conversions(value)
puts "Input decimal (BigDecimal): #{value}"
truncated = convert_bigdecimal_to_integer(value)
puts "Truncated (to_i): #{truncated}"
puts
end
# Main
show_float_conversions(12.7)
show_float_conversions(12.3)
show_float_conversions(-5.8)
show_float_conversions(42.0)
show_bigdecimal_conversions(BigDecimal("12.7"))
show_bigdecimal_conversions(BigDecimal("42"))
show_bigdecimal_conversions(BigDecimal("-5.8"))
=begin
run:
Input decimal (Float): 12.7
Rounded (round): 13
Truncated (to_i): 12
Input decimal (Float): 12.3
Rounded (round): 12
Truncated (to_i): 12
Input decimal (Float): -5.8
Rounded (round): -6
Truncated (to_i): -5
Input decimal (Float): 42.0
Rounded (round): 42
Truncated (to_i): 42
Input decimal (BigDecimal): 0.127e2
Truncated (to_i): 12
Input decimal (BigDecimal): 0.42e2
Truncated (to_i): 42
Input decimal (BigDecimal): -0.58e1
Truncated (to_i): -5
=end
