Step 1. Complete the following program and record the results.   #include using namespace std; void rect_area(float, float, float); int main()  {           float width = 2.5, height = 3.1, area = 0.0;       ___________________________  //filling by calling rect_area() method            cout << "The area in main is " << area << endl;       return 0; } void rect_area(float width, float height, float area) {           area = width * height;        cout << "The area in the function is " << area << endl; }

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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.