Write a program in the StringManipulator class that creates a String variable that references a String object  holding the name of your favorite city. The program should display the following:  • The number of characters in the city name • The name of the city in all uppercase letters  • The name of the city in all lowercase letters  • The first character in the name of the city

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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.