go使用筆記

向下取整

a := 123.23
b := math.Floor(a)
fmt.Println(b)
           

四舍五入取整

string轉float

s := "3.1415926535"
v1, err := strconv.ParseFloat(v, 32)
v2, err := strconv.ParseFloat(v, 64)
//string到int 
int,err:=strconv.Atoi(string) 
//string到int64 
int64, err := strconv.ParseInt(string, 10, 64) 
//int到string 
string:=strconv.Itoa(int) 
//int64到string 
string:=strconv.FormatInt(int64,10)
//string到float32(float64)
float,err := strconv.ParseFloat(string,32/64)
//float到string
string := strconv.FormatFloat(float32, 'E', -1, 32)
string := strconv.FormatFloat(float64, 'E', -1, 64)