Python Math: Round a specified number upwards towards infinity and down towards negative infinity

Last update on April 02 2025 12:29:09 (UTC/GMT +8 hours)

41. Upward and Downward Rounding with Precision

Write a Python program to round a specified number upwards towards infinity and down towards negative infinity with precision 4.

Sample Solution:

Python Code:

import decimal
context = decimal.getcontext()
value = decimal.Decimal(1) / decimal.Decimal(17)
print("1/17 = ",value)
context.prec = 4
print("Precision: ",4)

context.rounding = getattr(decimal, 'ROUND_CEILING')
value = decimal.Decimal(1) / decimal.Decimal(17)
print("Round upwards towards infinity: ",value)

context.rounding = getattr(decimal, 'ROUND_FLOOR')
value = decimal.Decimal(1) / decimal.Decimal(17)
print("Round down towards negative infinity: ",value)

Sample Output:

1/17 =  0.05882352941176470588235294118                                                                       
Precision:  4                                                                                                 
Round upwards towards infinity:  0.05883                                                                      
Round down towards negative infinity:  0.05882

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to round a given Decimal number upward (ceil) and downward (floor) with precision 4, and then print both results.
• Write a Python function that takes a Decimal and rounds it to 4 decimal places using both decimal.ROUND_CEILING and decimal.ROUND_FLOOR, then returns the two values.
• Write a Python script to demonstrate the difference between rounding up and down for several Decimal values at precision 4, printing a comparison table.
• Write a Python program to generate a list of Decimal numbers, round each upwards and downwards with precision 4, and print the original and rounded values side by side.

Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a Python program to round a specified decimal by setting precision (between 1 and 4).
Next: Write a Python program to get the local and default precision.