Undefined variable not shown as error with Java Eclipse -

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By entering and compiling Java class, there was no error in the code 

 < Code> public class exam {public static zero main (string agre []) {xCase = yCase + 100; }}   
 The identifiers xCase and yCase can not be defined, this can not be correct, so I got 2 errors by running the command line compiler to check it  
  C: \ Test> Javac Test. Java Test. Java <> Error: Icons can not find xCase = yCase + 100; ^ Symbol: Variable xCase Location: Class Test Test. Java Sign: Error: The icon xCase = yCase + 100 can not be found; ^ Symbol: Variable yCase Location: Class Test 2 Errors   
 Why is Eclipse not showing me this error?   
 
 
 Resolve red markers in "Marker" first.

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