How to declare a function?
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  • What you'll learn
    • ✓Functions are used to perform certain actions, and they are important for reusing code: Define the code once, and use it many times. Create a Function. C++ ...
    ✓How is a function declared in C++?
    ✓How to Use Functions in C - Explained With Examples -
    ✓How to call a function in C++?
    ✓What is the write function in CPP?
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  • The syntax for a function declaration is: return_type function_name(parameter_list); In this example, int is the return type of the function, add is the name of the function, and (int x, int y) is the parameter list that specifies two integer parameters called “x” and “y.”
  • the functions defined outside the class can be explicitly made inline by prefixing the keyword inline before the return type of the function in the function header. For example, consider the definition of the function getdata().
  • get() in C++ function inside the main code, first, we must create a variable from which the function will access the characters. Inside the cin. get() function, we declare two parameters. The first is the name of the array, and the second is the array size we want to get as the output.
  • Functions are called by their names. If the function is without argument, it can be called directly using its name. But for functions with arguments, we have two ways to call them, Call by Value.
  • All methods and functions should begin with a capital letter. The first letter of each word should also be capitalized. Special characters such as dashes and underscores are prohibited. The method name chosen should be descriptive of the method functionality.
  • Functions are used to perform certain actions, and they are important for reusing code: Define the code once, and use it many times.
  • Functions help us in reducing code redundancy. If functionality is performed at multiple places in software, then rather than writing the same code, again and again, we create a function and call it everywhere. This also helps in maintenance as we have to make changes in only one place if we make changes to the functionality in future. Functions make code modular. Consider a big file having many lines of code. It becomes really simple to read and use the code, if the code is divided into functions. Functions provide abstraction. For example, we can use library functions without worrying about their internal work.
  • User Defined Function User-defined functions are user/customer-defined blocks of code specially customized to reduce the complexity of big programs. They are also commonly known as “tailor-made functions” which are built only to satisfy the condition in which the user is facing issues meanwhile reducing the complexity of the whole program. Library Function Library functions are also called “built-in Functions“. These functions are part of a compiler package that is already defined and consists of a special function with special and different meanings. Built-in Function gives us an edge as we can directly use them without defining them whereas in the user-defined function we have to declare and define a function before using them. For Example: sqrt(), setw(), strcat(), etc.
  • Pass by Value: In this parameter passing method, values of actual parameters are copied to the function’s formal parameters. The actual and formal parameters are stored in different memory locations so any changes made in the functions are not reflected in the actual parameters of the caller. Pass by Reference: Both actual and formal parameters refer to the same locations, so any changes made inside the function are reflected in the actual parameters of the caller.
  • #include <iostream> using namespace std; void fun(int x) { // definition of // function x = 30; } int main() { int x = 20; fun(x); cout << "x = " << x; return 0; }

Requirement

The syntax for a function declaration is: return_type function_name(parameter_list); In this example, int is the return type of the function, add is the name of the function, and (int x, int y) is the parameter list that specifies two integer parameters called “x” and “y.”

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