Home » C programs » C one-dimensional array programs

Initialising byte array with Decimal, Octal and Hexadecimal numbers in C

Here, we are going to learn how to declare byte array and initialise array with decimal, octal and hexadecimal numbers in C language.
Submitted by IncludeHelp, on September 06, 2018

byte array in C

In C programming language, an unsigned char type can be used to declare byte array in C programming language. An unsigned char can contain a value from 0 to 255, which is the value of a byte.

In this example, we are declaring 3 arrays – arr1, arr2, and arr3, arr1 is initialising with decimal elements, arr2 is initialising with octal numbers and arr3 is initialising with hexadecimal numbers.

Example:

#include <stdio.h>

int main()
{
	//declaring array, initialising with decimal values	
	unsigned char arr1[]={10, 20, 30, 40, 50};
	//declaring array, initialising with octal values	
	unsigned char arr2[]={010, 077, 023, 045, 057};		
	//declaring array, initialising with hexadecimal values	
	unsigned char arr3[]={0x10, 0xAA, 0x67, 0xA1, 0xFF};	
	int i;
	
	//printing the numbers
	printf("arr1...\n");
	for(i=0; i<5; i++)
		printf("%d ",arr1[i]);
	printf("\n");

	//printing the numbers
	printf("arr2...\n");
	for(i=0; i<5; i++)
		printf("%o ",arr2[i]);
	printf("\n");
	
	//printing the numbers
	printf("arr3...\n");
	for(i=0; i<5; i++)
		printf("%X ",arr3[i]);	
	printf("\n");
	
	return 0;	
}

Output

arr1...
10 20 30 40 50 
arr2...
10 77 23 45 57 
arr3...
10 AA 67 A1 FF