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#define foo(t) do { \ int x = (t); \ printf("%d\n", x); \ } while(0) int x = 42; foo(x); will print 0 and not 42. If you have a complicated expression which needs to return a value, you can use the comma operator: #define allocate(foo, len) (foo->tmp = foo->head, foo->head += len, foo->tmp)
- C "Hello, World!" Program.
- C Program to Print an Integer (Entered by the User)
- C Program to Add Two Integers.
- C Program to Multiply Two Floating-Point Numbers.
- Predefined Standard Library Functions
- User Defined Functions
- Syntax of A Function
Standard library functions are also known as built-in functions. Functions such as puts(), gets(), printf(), scanf() etc are standard library functions. These functions are already defined in header files (files with .h extensions are called header files such as stdio.h), so we just call them whenever there is a need to use them. For example, print...
The functions that we create in a program are known as user defined functions or in other words you can say that a function created by user is known as user defined function. Now we will learn how to create user defined functions and how to use them in C Programming
return_type:Return type can be of any data type such as int, double, char, void, short etc. Don’t worry you will understand these terms better once you go through the examples below. function_name: It can be anything, however it is advised to have a meaningful name for the functions so that it would be easy to understand the purpose of function jus...
- Syntax of Functions in C. The syntax of function can be divided into 3 aspects: Function Declaration. Function Definition. Function Calls.
- Function Declarations. In a function declaration, we must provide the function name, its return type, and the number and type of its parameters. A function declaration tells the compiler that there is a function with the given name defined somewhere else in the program.
- Function Definition. The function definition consists of actual statements which are executed when the function is called (i.e. when the program control comes to the function).
- Function Call. A function call is a statement that instructs the compiler to execute the function. We use the function name and parameters in the function call.
There are all together 32 keywords in C programming language. A brief description of all keywords in C programming is given in this tutorial.
Learn by examples! This tutorial supplements all explanations with clarifying examples. See All C Examples. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML.
Fundamentals. Hello world program in C. Basic input/output. Basic IO on all data types. Perform arithmetic operations. Find area and perimeter of rectangle. Find diameter and area of circle. Find area of triangle. Find angles of triangle.
