Go经典案例：打印九九乘法表

//九九乘法表
	for i := 1; i <= 9; i++ {
		for j := 1; j <= i; j++ {
			fmt.Printf("%v * %v = %v", j, i, j*i)
			fmt.Print("     ")
		}
		fmt.Println()
	}

输出效果：

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   

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