Panic: runtime error: index out of range [5] with length 5 [closed]

Question 1

I wrote this program,

package main

import "fmt"

func main() {
    x := "Hello"

    for i := 0; i <= 10; i++ {
        fmt.Printf("%#U\n", x[i])
    }
}

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?

Question 2

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])
    }
}

Or this,

package main

import "fmt"

func main() {
    x := "Hello"
    for i := 0; i <= 10; i++ {
        fmt.Printf("%#U\n", x[i%len(x)])
    }
}

Question 3

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"

rocka2q · Answer 1 · 2021-11-24T06:11:58

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])
    }
}

Or this,

package main

import "fmt"

func main() {
    x := "Hello"
    for i := 0; i <= 10; i++ {
        fmt.Printf("%#U\n", x[i%len(x)])
    }
}

miftahulrespati · Answer 2 · 2021-11-24T05:52:29

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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