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