问题

我有以下代码：

package main

import (
	"fmt"
)

func main() {
     book := "The_colour_of_magic"
     fmt.Println(book[0])
}

当我执行这段代码时，我得到的结果是84（T字母的ASCII值）。

请问为什么我得到的答案是84而不是T。

英文:

I have this below code:

package main

import (
	&quot;fmt&quot;
)

func main() {
     book := &quot;The_colour_of_magic&quot;
     fmt.Println(book[0])
}

When I am executing this code, I am getting the result as 84 (ASCII value of T alphabet).

May I know why I am getting the answer as 84 instead of T.

答案1

得分: 4

根据定义，字符串是字节的切片，而字节本质上是无符号8位整数（uint8）。

当你引用book[0]时，你引用的是一个字节，即uint8类型。

尝试添加以下代码行以查看book[0]的类型：

fmt.Printf("book[0]的类型：%T", book[0])

由于你试图打印book[0]中的值，它将打印字节中的无符号整数值。

英文:

By definition string is a slice of bytes and byte is nothing but unsigned int 8 (uint8)

When you are referring to book[0] you are referring a byte and it uint8.

try adding this line to see type of book[0]

fmt.printf(&quot;Type of book[0]:%T&quot;, book[0])

As you are attempting to print value in book[0], it will print Unisgned Integer value in the byte.

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