创建一个函数比较两个数大小

创建一个简单的函数来比较两个数的大小，通常在许多编程语言中都可以实现，比如Python、C++或JavaScript。这里我用Python和C++为例来展示如何编写这样的函数：

**Python:**

def compare_numbers(a, b):
    if a > b:
        return "a is greater than b"
    elif a < b:
        return "a is less than b"
    else:
        return "a is equal to b"

# 示例用法
result = compare_numbers(10, 5)
print(result)  # 输出：a is greater than b

**C++:**

#include <iostream>
#include <string>

std::string compare_numbers(int a, int b) {
    if (a > b) {
        return "a is greater than b";
    } else if (a < b) {
        return "a is less than b";
    } else {
        return "a is equal to b";
    }
}

int main() {
    int num1 = 10;
    int num2 = 5;
    std::cout << compare_numbers(num1, num2) << std::endl;  // 输出：a is greater than b
    return 0;
}

在上述代码中，`compare_numbers`函数接受两个参数，比较它们的值，并返回一个字符串描述它们之间的关系。