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话说每个程序员学习for循环都会完成以下的两个小项目，所以兴致勃勃的自己动手写了以下

• 水仙花数

package mainimport (	"fmt"	"math"	"strconv"	"time")func main()  {
   	//1000000以内的水仙花数	starTime := time.Now()	var i int	for i = 1; i < 1000000; i++ {
   		var num1 int = len(strconv.Itoa(i))		var num2 int = len(strconv.Itoa(i))		var s [20]int		var sum = 0		for j := 0; j < num1; j++ {
   			s[j] = i / int(math.Pow10(num1-j-1)) % 10			sum = sum + int(math.Pow(float64(s[j]), float64(num2)))		}		if sum == i {
   			fmt.Println(i)		}	}	takeTime := time.Since(starTime)	fmt.Println("耗时：", takeTime)}

水仙花数执行结果：

153370371407163482089474547489272793084548834耗时： 1.1019941s

• 乘法表
  代码如下：

package mainimport (	"fmt")func main()  {
       //乘法表	var i int	var j int	for i = 1; i < 10; i++ {
   		for j = 1; j <= i; j++ {
   			s := i * j			fmt.Printf("%d x %d = %d ", j, i, s)		}		println()	}}

执行结果如下：

1 x 1 = 11 x 2 = 2 2 x 2 = 41 x 3 = 3 2 x 3 = 6 3 x 3 = 91 x 4 = 4 2 x 4 = 8 3 x 4 = 12 4 x 4 = 161 x 5 = 5 2 x 5 = 10 3 x 5 = 15 4 x 5 = 20 5 x 5 = 251 x 6 = 6 2 x 6 = 12 3 x 6 = 18 4 x 6 = 24 5 x 6 = 30 6 x 6 = 361 x 7 = 7 2 x 7 = 14 3 x 7 = 21 4 x 7 = 28 5 x 7 = 35 6 x 7 = 42 7 x 7 = 491 x 8 = 8 2 x 8 = 16 3 x 8 = 24 4 x 8 = 32 5 x 8 = 40 6 x 8 = 48 7 x 8 = 56 8 x 8 = 641 x 9 = 9 2 x 9 = 18 3 x 9 = 27 4 x 9 = 36 5 x 9 = 45 6 x 9 = 54 7 x 9 = 63 8 x 9 = 72 9 x 9 = 81

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