Functions
- 1. { Functions Abdullah Hassan Al ElianiName : Academic Number : 214363617 Supervision : Ibrahim Al Odieni
- 2. A function is a group of statements that together perform a task. Every C++ program has at least one function, which is main(), and all the most trivial programs can define additional functions. A function declaration tells the compiler about a function's name, return type, and parameters. A function definition provides the actual body of the function. Introduction
- 3. { A C++ function definition consists of a function header and a function body. Here are all the parts of a function: Return Type: A function may return a value. The return_type is the data type of the value the function returns. Some functions perform the desired operations without returning a value. In this case, the return_type is the keyword void. Function Name: This is the actual name of the function. The function name and the parameter list together constitute the function signature. Parameters: A parameter is like a placeholder. When a function is invoked, you pass a value to the parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a function. Parameters are optional; that is, a function may contain no parameters. Function Body: The function body contains a collection of statements that define what the function does.
- 4. { Function declaration, is done to tell the compiler about the existence of the function. Function's return type, its name & parameter list is mentioned. Function body is written in its definition look at the example up.
- 5. { Example: #include < iostream> using namespace std; int sum (int x, int y); //declaring function int main() { int a = 10; int b = 20; int c = sum (a, b); //calling function cout << c; } int sum (int x, int y) //defining function { return (X + y); }
- 6. { Here, initially the function is declared, without body. Then inside main() function it is called, as the function returns sumation of two values, hence z is their to store the value of sum. Then, at last, function is defined, where the body of function is mentioned. We can also, declare & define the function together, but then it should be done before it is called.
- 7. http://www.studytonight.com/cpp/functions- in-cpp https://www.tutorialspoint.com/cplusplus/cpp_ functions.htm http://www.cplusplus.com/doc/tutorial/functio ns/ refrences