2.21 Is the following assignment statement valid or invalid? If it is invalid, why? 72 = amount; 2.22 How would you consolidate the following definitions into one statement? int x = 7; int y = 16; int z = 28; 2.23 What is wrong with the following program? How would you correct it? #include using namespace std; int main () { number = 62.7; double number; cout << number << 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.