从字符串中删除最后一个字符

要从字符串中删除最后一个字符，可以使用多种编程语言中的字符串操作方法。以下是一些常见编程语言的示例代码：

Python

def remove_last_char(s):
    return s[:-1]

# 示例
original_string = "Hello, World!"
modified_string = remove_last_char(original_string)
print(modified_string)  # 输出: Hello, World

JavaScript

function removeLastChar(str) {
    return str.slice(0, -1);
}

// 示例
const originalString = "Hello, World!";
const modifiedString = removeLastChar(originalString);
console.log(modifiedString);  // 输出: Hello, World

Java

public class Main {
    public static String removeLastChar(String str) {
        if (str == null || str.isEmpty()) {
            return str;
        }
        return str.substring(0, str.length() - 1);
    }

    public static void main(String[] args) {
        String originalString = "Hello, World!";
        String modifiedString = removeLastChar(originalString);
        System.out.println(modifiedString);  // 输出: Hello, World
    }
}

C#

using System;

public class Program
{
    public static string RemoveLastChar(string str)
    {
        if (string.IsNullOrEmpty(str))
        {
            return str;
        }
        return str.Substring(0, str.Length - 1);
    }

    public static void Main()
    {
        string originalString = "Hello, World!";
        string modifiedString = RemoveLastChar(originalString);
        Console.WriteLine(modifiedString);  // 输出: Hello, World
    }
}

PHP

<?php
function removeLastChar($str) {
    return substr($str, 0, -1);
}

$originalString = "Hello, World!";
$modifiedString = removeLastChar($originalString);
echo $modifiedString;  // 输出: Hello, World
?>

Ruby

def remove_last_char(str)
    str[0...-1]
end

original_string = "Hello, World!"
modified_string = remove_last_char(original_string)
puts modified_string  # 输出: Hello, World