Rust语言编程实例100题-008

题目：乘法口诀（也叫“九九歌”）在我国很早就已产生。远在春秋战国时代，九九歌就已经广泛地被人们利用着。常用的乘法口诀有两种，一种是45句的，通常称为小九九；还有一种是81句的，通常称为大九九。你能用Rust输出99乘法口诀（小九九）吗。输出时格式要对齐。

程序分析：可以考虑分行与列，总共 9 行 9 列，i 控制行，j 控制列。使用制表符\t分隔。

知识点：循环

fn main() {
    for i in 1..10 {
        for j in 1..=i {
            print!("{} * {} = {}\t", j, i, j * i)
        }
        println!();
    }
}

程序执行结果：

1 * 1 = 1   
1 * 2 = 2   2 * 2 = 4   
1 * 3 = 3   2 * 3 = 6   3 * 3 = 9   
1 * 4 = 4   2 * 4 = 8   3 * 4 = 12  4 * 4 = 16  
1 * 5 = 5   2 * 5 = 10  3 * 5 = 15  4 * 5 = 20  5 * 5 = 25  
1 * 6 = 6   2 * 6 = 12  3 * 6 = 18  4 * 6 = 24  5 * 6 = 30  6 * 6 = 36  
1 * 7 = 7   2 * 7 = 14  3 * 7 = 21  4 * 7 = 28  5 * 7 = 35  6 * 7 = 42  7 * 7 = 49  
1 * 8 = 8   2 * 8 = 16  3 * 8 = 24  4 * 8 = 32  5 * 8 = 40  6 * 8 = 48  7 * 8 = 56  8 * 8 = 64  
1 * 9 = 9   2 * 9 = 18  3 * 9 = 27  4 * 9 = 36  5 * 9 = 45  6 * 9 = 54  7 * 9 = 63  8 * 9 = 72  9 * 9 = 81  

Process finished with exit code 0