如何输出十六进制字符串

在大多数编程语言中，将整数转换为十六进制字符串通常有现成的函数或方法。以下是几种常见编程语言的示例：

**Python:**

def int_to_hex(num):
    return hex(num)[2:]

# 示例
number = 42
hex_string = int_to_hex(number)
print(hex_string)  # 输出 "0x2a"

**Java:**

public class Main {
    public static void main(String[] args) {
        int number = 42;
        String hexString = Integer.toHexString(number);
        System.out.println("0x" + hexString);  // 输出 "0x2a"
    }
}

**JavaScript:**

function intToHex(num) {
    return num.toString(16).toUpperCase();
}

// 示例
let number = 42;
let hexString = intToHex(number);
console.log(hexString);  // 输出 "2A"

**C++ (C++11以后):**

#include <iostream>
#include <sstream>

std::string intToHex(int num) {
    std::stringstream ss;
    ss << std::hex << num;
    return ss.str();
}

int main() {
    int number = 42;
    std::string hexString = intToHex(number);
    std::cout << hexString;  // 输出 "2a"
}