C Programming - Library Functions

The C standard library consists of a set of sections of the ISO C standard which describe a collection of header files and library routines used to implement common operations, such as input/output and string handling, in the C programming language. The C standard library is an interface standard described by a document; it is not an actual library of software routines available for linkage to C programs.

No. It will print something like 'IndiaBIX(some garbage values here)' .

Because after copying the first 8 characters of source string into target string strncpy() doesn't terminate the target string with a '\0'. So it may print some garbage values along with IndiaBIX.

itoa() takes the integer input value input and converts it to a number in base radix. The resulting number a sequence of base-radix digits.

Example:

/* itoa() example */
#include <stdio.h>
#include <stdlib.h>

int main ()
{
	int no;
	char buff [50];
	printf ("Enter number: ");
	scanf ("%d",&no);
    
	itoa (no,buff,10);
	printf ("Decimal: %s\n",buff);
    
	itoa (no,buff,2);
	printf ("Binary: %s\n",buff);
    
	itoa (no,buff,16);
	printf ("Hexadecimal: %s\n",buff);
    
	return 0;
}

Output:
Enter a number: 1250
Decimal: 1250
Binary: 10011100010
Hexadecimal: 4e2

string.h is the header in the C standard library for the C programming language which contains macro definitions, constants, and declarations of functions and types used not only for string handling but also various memory handling functions.

scanf is a function that reads data with specified format from a given string stream source.
scanf("%d",&number);

atoi() convert string to integer.
var number;
number = atoi("string");