I need this code to have function definition, function prototype and function calling   #include #include using namespace std; int main() {     ifstream inFile;     inFile.open ("numbers.txt");     int numberOfItems = 9;     int number;     int sum=0;     float average;     if (inFile.fail())     {         cout << "Error opening file." <> number)         sum = sum + number;         numberOfItems++;     average = sum / numberOfItems;     cout << "Average: " << average;     inFile.close();     return 0; }   The numbers from the text should be: 78 85 2 45 12 99 65 9 15 65

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Types of Function

A function is a process or task that does some operation in the program. Some programming languages may contain built-in functions for certain commonly used tasks. Most programming languages also support user-defined functions, which means a user can write their own function to perform some operation. There are some libraries or header files that contain built-in functions for performing certain tasks.