面试题：Rust中write!宏在控制台简单格式化输出场景的应用

Question

在Rust中，要求使用write!宏将变量`let num = 42;`和字符串`let text = "answer";` 以`The answer is 42`这种格式输出到控制台，请编写相应代码。

Answer 1

fn main() {
    let num = 42;
    let text = "answer";
    let mut result = String::new();
    write!(&mut result, "The {} is {}", text, num).expect("Failed to write to string");
    println!("{}", result);
}