the function returns the result as a string if the expression is legal. the expression returns an empty string and then put the function   public class Ez1MathEval { public String heavywtEval (String exprn) { return "" } }

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Header files

A file with an extension that has some predefined declarations and definitions is called a header file. Every computer program imports a set of header files to perform common tasks such as getting input, displaying output, and so forth. Every language has different header files (such as C, JAVA, Python, and C++). In this article, header files are explained mainly in the context of the C/C++ language.