The principal square root function is defined using the nonpositive real axis as a branch cut.

主平方根函数是使用非正实轴作为分支切割定义的。

youdao

Consider the prototype for a simple square root function shown in Listing 1.

请考虑清单1所示的平方根函数的原型。

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The first line defines a function called square that takes an argument and emits its square root.

第一行定义一个名为square的函数，该函数可接受参数并发出其平方根。

youdao

to do sqrt, or square root-- no, I'm going to square root use sqrt, that's the name I'm using here-- square root a hundred different places in some piece of code. Without function, I'd have to copy that piece of code everywhere.

让我做一下准备,想象一下我要调用sqrt或者-,不，我会调用sqrt函数,这是我在这里用的名字，我得把这段代码到处复制。

麻省理工公开课 - 计算机科学及编程导论课程节选