What is output? #include #include #include using namespace std; int main () {   setnumber;   int i;   int myVar;   for (i = 0; i <=3; i++) {       number.insert(i*i);   }   myVar = number.count(9);   cout << myVar << endl;   return 0; } 3 0 9 1

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A: Given:

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A: Please refer to the following steps for the complete solution to the problem above.

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A: You forgot to include #include &lt;string.h&gt;

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A: GIVEN:

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A: Answer: I have complete function as in given question.

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A: Here are the UML class diagrams for the three classes:

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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.