Rust打印The Twelve Days of christmas歌词

1、网上搜了下歌词，歌词原文如下：

The Twelve Days Of Christmas - Songtime Kids
On the first day of Christmas
My true love sent to me
A partridge in a pear tree
On the second day of Christmas
My true love sent to me
Two turtle doves
And a partridge in a pear tree
On the third day of Christmas
My true love sent to me
Three French hens
Two turtle doves
And a partridge in a pear tree
On the fourth day of Christmas
My true love sent to me
Four calling birds
Three French hens
Two turtle doves
And a partridge in a pear tree
On the fifth day of Christmas
My true love sent to me
Five gold rings
Four calling birds
Three French hens
Two turtle doves
And a partridge in a pear tree
On the sixth day of Christmas
My true love sent to me
Six geese a-laying
Five gold rings
Four calling birds
Three French hens
Two turtle doves
And a partridge in a pear tree
On the seventh day of Christmas
My true love sent to me
Seven swans a-swimming
Six geese a-laying
Five gold rings
Four calling birds
Three French hens
Two turtle doves
And a partridge in a pear tree
On the eighth day of Christmas
My true love sent to me
Eight maids a-milking
Seven swans a-swimming
Six geese a-laying
Five gold rings
Four calling birds
Three French hens
Two turtle doves
And a partridge in a pear tree
On the ninth day of Christmas
My true love sent to me
Nine ladies dancing
Eight maids a-milking
Seven swans a-swimming
Six geese a-laying
Five gold rings
Four calling birds
Three French hens
Two turtle doves
And a partridge in a pear tree
On the tenth day of Christmas
My true love sent to me
Ten Lords a Leaping
Nine ladies dancing
Eight maids a-milking
Seven swans a-swimming
Six geese a-laying
Five gold rings
Four calling birds
Three French hens
Two turtle doves
And a partridge in a pear tree
On the eveth day of Christmas
My true love sent to me
Eleven Pipers Piping
Ten Lords a Leaping
Nine ladies dancing
Eight maids a-milking
Seven swans a-swimming
Six geese a-laying
Five golden Rings
Four calling birds
Three French hens
Two turtle doves
And a partridge in a pear tree
On the Twelve day of Christmas
My true love sent to me
Twelve Drummers Drumming
Eleven Pipers Piping
Ten Lords a Leaping
Nine ladies dancing
Eight maids a-milking
Seven swans a-swimming
Six geese a-laying
Five golden Rings
Four calling birds
Three French hens
Two turtle doves
And a partridge in a pear tree

2、分析一下歌词内容，大概需要嵌套循环来解决问题，代码如下：

fn main() {
    let count = [
        "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth",
        "tenth", "eveth", "Twelve",
    ];

    println!("The Twelve Days of christmas - Songtime Kids");

    for i in 0..count.len() {
        println!(
            "On the {} day of Christmas 
        
My true love sent to me",
            count[i]
        );
        if i == 0 {
            println!("A partridge in a pear tree");
            continue;
        }
        for j in 0..=i {
            match i - j {
                0 => println!("And a partridge in a pear tree"),
                1 => println!("Two turtle doves"),
                2 => println!("Three French hens"),
                3 => println!("Four calling birds"),
                4 => println!("Five golden Rings"),
                5 => println!("Six geese a-laying"),
                6 => println!("Seven swans a-swimming"),
                7 => println!("Eight maids a-milking"),
                8 => println!("Nine ladies dancing"),
                9 => println!("Ten Lords a Leaping"),
                10 => println!("Eleven Pipers Piping"),
                11 => println!("Twelve Drummers Drumming"),
                _ => (),
            }
        }
    }
}

3、欢迎勘误 End