C Standard Built-in Library Functions

C Standard Built-in Library Functions

C standard built-in library functions; In this tutorial, you’ll learn standard built-in library functions in C.

C Standard Built-in Library Functions

  • What is built-in Library Functions in C
  • List of all c standard built-in library functions
  • Advantages of Standard built-in Library Functions in C
  • Example 1 – Find the length of the string using strlen Function in C

What is built-in Library Functions in C

Standard library functions are functions that have already been created and kept in a file called a library. And can use this library functions to perform certain tasks in C programming languages, such as string handling, mathematical calculations, input/output processing, memory management, and many other operating system services.

For example, You must have used the printf() function in C, whenever you have created the program in c language. This function is under stdio.io library. As follow:

#include <stdio.h>
int main()
{
   printf("Catch me if you can."); 
}

Note that:- The printf() function, is a function of the standard library. which is used to print in C program

List of all c standard built-in library functions

List of Standard Library Functions in c; as follows:

C Header FilesDescription
<assert.h>Program assertion functions
<ctype.h>Character type functions
<locale.h>Localization functions
<math.h>Mathematics functions
<setjmp.h>Jump functions
<signal.h>Signal handling functions
<stdarg.h>Variable arguments handling functions
<stdio.h>Standard Input/Output functions
<stdlib.h>Standard Utility functions
<string.h>String handling functions
<time.h>Date time functions

Advantages of Standard built-in Library Functions in C

  • C library functions is very simple.
  • The functions are optimized for performance
  • It saves considerable development time
  • The functions are portable

Example 1 – Find the length of the string using strlen Function in C

Using the c string standard library function strlen() function find the length of the string in C program; as follows:

#include <stdio.h>
#include <string.h>
int main()
{
   char name[100];
   printf("Enter a string: ");
   scanf("%s",name); 

   // find the length of string and print it
   printf("Length of string a = %zu \n",strlen(name));

   return 0;
}

Output of the above c program; as follows:

Enter a string: tutsmake
Length of string a = 8 

AuthorAdmin

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of Tutsmake.com. I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.

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