C Standard Built-in Library Functions

C standard built-in library functions; Through this tutorial, i am going to teach you standard built-in library functions in C programming language.

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 

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