Why are some strings cutoff when attempting to read a mixture of numeric and non-numeric input as in the following code?

为什么一些字符串截断试图读取一个数字和非数字输入，如下面的代码混合的时候？

youdao

Why are some strings cutoff when attempting to read a mixture of numeric and non-numeric input as in the following code?

为什么一些字符串截断试图读取一个数字和非数字输入，如下面的代码混合的时候？

youdao