Python编程入门求助：编写按指定公式计算Q值的程序

开发者阿泽

2026-5-20

Hey there! Since you're new to programming, let's work through this Q-value calculation problem together — it's simpler than it looks once we break it down.

解决Q值计算的Python程序

问题梳理

First, let's lay out all the given info clearly:

Fixed constants: C = 50, H = 30
Input: A comma-separated sequence of numbers (like 100,150,180) representing the variable D
Formula: Q = √[(2 * C * D)/H]
Output: Comma-separated integers matching the example (we'll need to truncate the calculated Q to whole numbers)

Step-by-Step Implementation

Here's how to build the program step by step:

Get and process input: Read the user's input string, split it into individual D values, and convert them to integers. We'll also handle any accidental spaces in the input (like 100, 150, 180).
Calculate Q for each D: Loop through each D value, apply the formula, and convert the result to an integer (since the example uses whole numbers).
Format and output: Combine the calculated Q values into a comma-separated string and print it.

Full Code Example

import math

# Define fixed constants
C = 50
H = 30

# Get input from user and clean it up
user_input = input("Enter comma-separated D values: ").strip()
d_list = [int(d.strip()) for d in user_input.split(',')]

# Calculate Q values and convert to integers
q_list = [str(int(math.sqrt((2 * C * d) / H))) for d in d_list]

# Print the final result
print(','.join(q_list))

Code Breakdown

import math: We need this to use Python's built-in square root function math.sqrt().
user_input.split(','): Splits the input string into a list using commas as separators. d.strip() removes any leading/trailing spaces from each D value.
math.sqrt((2 * C * d)/H): Computes the square root as per the given formula. Wrapping it in int() truncates the decimal part (which matches the example's output of 18, 22, 24).
','.join(q_list): Converts the list of Q values back into a comma-separated string for clean output.