有些朋友问:foo, bar是什么意思, 为什么C++书籍中老见到这个词。
我google了一下, 发现没有很好的中文答案。这个问题,在维基百科上有很好的回答。在这里翻译给大家。
译文:
术语foobar, foo, bar, baz 和qux经常在计算机编程或计算机相关的文档中被用作占位符的名字。当变量,函数,或命令本身不太重要的时候,foobar, foo, bar, baz 和qux就被用来充当这些实体的名字,这样做的目的仅仅是阐述一个概念,说明一个想法。这些术语本身相对于使用的场景来说没有任何意义。Foobar经常被单独使用;而当需要多个实体举例的时候,foo,bar,和baz则经常被按顺序使用。
原文:
The terms foobar, foo, bar, baz and qux are sometimes used as placeholder names (also referred to as metasyntactic variables) in computer programming or computer-related documentation.[1] They have been used to name entities such as variables, functions, and commands whose purpose is unimportant and serve only to demonstrate a concept. The words themselves have no meaning in this usage. Foobar is sometimes used alone; foo, bar, and baz are sometimes used in that order, when multiple entities are needed.
// C code example
#include <stdio.h>
int foobar(int *pi)
{
*pi = 1024;
return *pi;
}
int main()
{
char foo[] = "Hello,";
char bar[] = "World!";
printf("%s %s\n", foo, bar);
int baz = foobar();
printf("%d, baz");
return 0;
}