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Apr 6, 2023 · How to Call a Function in C. We can call a function from anywhere in the program once we've defined it. We use the function name followed by the argument list in parentheses to call a function. For example, we can use the following code to call the sum function that we defined earlier: int a = 5; int b = 10; int c = sum(a, b);
Call a Function. Declared functions are not executed immediately. They are "saved for later use", and will be executed when they are called. To call a function, write the function's name followed by two parentheses () and a semicolon ; In the following example, myFunction() is used to print a text (the action), when it is called: Example.
Jun 29, 2020 · In this tutorial, we will learn functions in C programming. A function is a block of statements that performs a specific task. Let’s say you are writing a C program and you need to perform a same task in that program more than once. In such case you have two options: a) Use the same set of statements every time you want to perform the task
- 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.
C Function Examples. A function is a block of code that performs a specific task. You will find examples related to functions in this article. To understand examples in this page, you should have the knowledge of the following topics: User-Defined Function. Types of User-defined functions.
Aug 6, 2024 · Here's an example: # include <stdio.h> int square ( int a ) { return a * a ; } int sum_of_squares ( int a , int b ) { return square ( a ) + square ( b ) ; } int main ( ) { int result = sum_of_squares ( 3 , 4 ) ; printf ( "Sum of squares: %d\\n" , result ) ; return 0 ; }
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Here’s an example of a function call, taken from an example near the beginning (see Complete Program). printf ("Fibonacci series item %d is %d\n", 19, fib (19)); The three arguments given to printf are a constant string, the integer 19, and the integer returned by fib (19) .
