1. Go 九九乘法表

方式一

package main

import "fmt"

func main() {
	// Iterate over the rows (1 to 9)
	for row := 1; row <= 9; row++ {
		// Iterate over the columns (1 to row)
		for col := 1; col <= row; col++ {
			// Calculate the product
			product := row * col

			// Print the product
			fmt.Printf("%d x %d = %d\t", row, col, product)
		}
		// Print a newline after each row
		fmt.Println()
	}
}

方式二

package main

import "fmt"

func printTable(row, col int) {
	if row > 9 || col > row {
		return // Base case: exit when row or col exceeds limits
	}

	product := row * col
	fmt.Printf("%d x %d = %d\t", row, col, product)

	// Print next column in the same row
	printTable(row, col+1)

	// If at the end of the row, move to the next row with col 1
	if col == row {
		fmt.Println()
		printTable(row+1, 1)
	}
}

func main() {
	printTable(1, 1)
}