9+ Round 関数 使い方 References
What is the Round Function?
The round function is a built-in function in programming languages such as Python, Java, and C++. It is used to round off a given number to the nearest whole number or a certain number of decimal places.
How to Use the Round Function
The syntax for using the round function may vary slightly depending on the programming language you are using. Generally, the function takes two arguments: the number you want to round and how many decimal places you want to round to.
Rounding to the Nearest Whole Number
To round a number to the nearest whole number, you can simply pass the number as the first argument and 0 as the second argument:
round(3.6, 0) # Output: 4
Rounding to a Specific Number of Decimal Places
If you want to round a number to a certain number of decimal places, you can pass the number as the first argument and the number of decimal places as the second argument:
round(3.14159265359, 2) # Output: 3.14
Examples of Using the Round Function
Let's look at some real-world examples of using the round function:
Example 1: Calculating the Average Temperature
Suppose you have a list of temperatures in Celsius and you want to calculate the average temperature in Fahrenheit:
celsius_temps = [23, 25, 27, 29, 31] fahrenheit_temps = [round((t * 9/5) + 32, 1) for t in celsius_temps] average_temp = round(sum(fahrenheit_temps) / len(fahrenheit_temps), 1) print(average_temp) # Output: 81.9
Example 2: Calculating the Tip Amount
Suppose you want to calculate the tip amount for a restaurant bill:
bill_amount = 45.67 tip_percent = 20 tip_amount = round(bill_amount * tip_percent / 100, 2) print(tip_amount) # Output: 9.13
Conclusion
The round function is a useful tool for dealing with numbers in programming. It allows you to round off numbers to the nearest whole number or a certain number of decimal places. By understanding how to use the round function, you can write more efficient and accurate code.
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