英文:
panic: runtime error: index out of range [5] with length 5
问题
我写了这个程序，
package main
import "fmt"
func main() {
x := "Hello"
for i := 0; i <= 10; i++ {
fmt.Printf("%#U\n", x[i])
}
}
链接：https://go.dev/play/p/yrMu2hlAvkZ
恐慌：运行时错误：索引超出范围 [5]，长度为 5
我知道为什么会出现错误，这是由于循环条件中的 i<=10，如果我移除 =，就不会出现错误。
但是假设我想以这样的方式编写代码，即使我仍然使用 i<=10，也不会出现错误。该怎么做？
英文:
I wrote this program,
package main
import "fmt"
func main() {
x := "Hello"
for i := 0; i <= 10; i++ {
fmt.Printf("%#U\n", x[i])
}
}
https://go.dev/play/p/yrMu2hlAvkZ
panic: runtime error: index out of range [5] with length 5
I know the reason why it's giving the error, it's due to the condition in for loop i<=10 and if I remove the = it will not give me the error.
But let's say I want to code it in such a way that I won't get errors if I still use i<=10. How can it be done?
答案1
得分: 1
你可以这样安全地循环：
package main
import "fmt"
func main() {
x := "Hello"
for i := 0; i <= 10 && i < len(x); i++ {
fmt.Printf("%#U\n", x[i])
}
}
或者这样：
package main
import "fmt"
func main() {
x := "Hello"
for i := 0; i <= 10; i++ {
fmt.Printf("%#U\n", x[i%len(x)])
}
}
链接：
英文:
> I want to code it in such a way that I won't get error if i still use
> "i<=10". How can it be done?
You can safely loop like this,
package main
import "fmt"
func main() {
x := "Hello"
for i := 0; i <= 10 && i < len(x); i++ {
fmt.Printf("%#U\n", x[i])
}
}
https://go.dev/play/p/2NknjS3Ql6k
Or this,
package main
import "fmt"
func main() {
x := "Hello"
for i := 0; i <= 10; i++ {
fmt.Printf("%#U\n", x[i%len(x)])
}
}
答案2
得分: 0
你可以选择更改条件，将 i <= 10 改为
i <= 4 // 4 是你的字符串的最后一个索引
或者你可以增加字符串的长度，将 x := "Hello" 改为
x := "Hello World"
英文:
You can either change your condition, from i <= 10 to
i <= 4 // 4 is the last index of your string
or you can increase your string length, from x := "Hello" to
x := "Hello World"
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