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C Standard Library Functions

C Standard Library Functions
C Standard Library Functions

C Standard Library Functions: In this tutorial, you’ll find out about the standard library functions in c. More specifically, what are they, distinctive library functions in C and how to use them in your program?

C Standard library functions or basically C Library functions are inbuilt capacities in C programming.

The prototype and data meanings of these capacities are available in their individual header files. To utilize these capacities we have to incorporate the header record in our program. For instance,

If you want to use the printf() function, the header file should be included.

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

If you try to use printf() without including the stdio.h header file, you will get an error.


Advantages of Using C library functions

1. They work

One of the most significant reasons you should use the library functions is just in light of the fact that they work. These capacities have gone thorough multiple rigorous testing and are easy to use.

2. The functions are optimized for performance

Since the functions are “standard library” works, a committed gathering of designers continually improve them. All the while, they can make the most productive code upgraded for the maximum performance.

3. It saves considerable development time

Since the general functions like printing to a screen, computing the square root, and a lot more areas of now composed. You shouldn’t stress over making them once again.

4. The functions are portable

With ever-changing real-world needs, your application is required to work inevitably, all over the place. What’s more, these library capacities help you in that they do something very similar on each computer.

Example: Square root using sqrt() function

Suppose, you want to find the square root of a number.

To can compute the square root of a number, you can use the sqrt() library function. The function is defined in math.h header file.

#include <stdio.h>
#include <math.h>
int main()
   float num, root;
   printf("Enter a number: ");
   scanf("%f", &num);

   // Computes the square root of num and stores in root.
   root = sqrt(num);

   printf("Square root of %.2f = %.2f", num, root);
   return 0;

When you run the program, the output will be:

Enter a number: 12
Square root of 12.00 = 3.46

Library Functions in Different Header Files

C Header Files
<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

Please feel free to give your comment if you face any difficulty here.

salman khan

Written by worldofitech

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