This program is meant to apply rot13 to input. However, when I compile I get warnings that lines 20, 23, 29 have no effect in code and line 17 is unreachable code. When anything is entered, it just continues the program and leaves a blank space. What's wrong?This program is meant to apply rot13 to input.
阅读背景：
代码没有效果，代码是不可访问的。
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