hexadecimal notation

基本解釋

Notation, which is unambiguous and cannot be confused with octal character codes; similarly, hexadecimal codes such as.
表示法，該表示法是明確的，并且不會與八進制符號代碼混淆；同樣，諸如。
For example a numeric value can be formatted in hexadecimal scientific notation or a series of digits separated into groups with a user-specified punctuation mark.
例如，可以將數(shù)值格式化為十六進制、科學(xué)記數(shù)法或者由用戶指定的標點符號分隔成組的一系列數(shù)字。
Hexadecimal notation such as 0x20to specify a space character
使用諸如 0x20 等十六進制符號來指定空格字符

This just means hexadecimal notation, which we'll come back to before long so really it just means it's returning the 0 address zero.
這表示的是16進制,我們等下還會討論，表示的是返回,地址。
哈佛公開課 - 計算機科學(xué)課程節(jié)選