在我的 CLI 程序中，我有這個功能，用戶可以告訴我他們想要多少特定產品的項目。因此，此輸入應為整數。我目前遇到一個問題，如果他們輸入一個字符串，它會出錯，expected an integer但隨后還會再次打印多次而不是一次。例子：How many Fruit Tea would you like to buy? qweexpected integerHow many Fruit Tea would you like to buy? expected integerHow many Fruit Tea would you like to buy? expected integerHow many Fruit Tea would you like to buy?下面是處理此功能的代碼for { fmt.Printf("How many %v would you like to buy? ", product.Name) _, err := fmt.Scan(&response) if err != nil { fmt.Println(err) continue } if ok, err := validResponse(response); ok { break } else { fmt.Println(err) continue }}在這個循環中我必須改變什么，所以它只重復一次問題？
1 回答
千巷貓影
TA貢獻1829條經驗 獲得超7個贊
如果可以，將responsefrom的類型切換為int，然后使用包（例如）string解析輸入字符串。我懷疑正在嘗試將您輸入的每個字符作為單獨的 int 讀取，每次都失敗，并且每次都運行循環，直到所有字符都被消耗完。strconvstrconv.Atoi()Scan
例如
for {
var response string
fmt.Printf("How many %v would you like to buy? ", product.Name)
_, err := fmt.Scanln(&response)
if err != nil { // probably don't need to check err from Scan()
fmt.Println(err)
continue
}
num, err := strconv.Atoi(response)
if err != nil {
fmt.Println("Enter an integer.")
continue
}
if ok, err := validResponse(num); ok && err==nil {
break
} else {
fmt.Println(err)
continue
}
}
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