首先，编写测试代码，如下：
package main
import (
"fmt"
)
func main() {
fmt.Printf("%s\n", "hello, world")
printNumber()
}
func printNumber() {
var count int;
count = 10
sum := 0
for i := 0; i < count; i++ {
sum = sum + i
fmt.Printf("i = %d, sum = %d\n", i, sum)
}
}
go build main.go
./main
