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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.

Initialising byte array with Decimal, Octal and Hexadecimal numbers

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 

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