[C language algorithm] Endianness

Implemented endian confirmation algorithm in C language

Environment used for learning

• ideone.com (https://ideone.com/)
• A site where you can learn programming online

Reference material

Latest algorithm dictionary in C language (written by Haruhiko Okumura / 1991 first edition Gijutsu-Hyoronsha: 16 pages)

Endian overview

The order of high-order bytes and low-order bytes is commonly called endian. Little endian is the youngest address in memory, and big endian is the opposite.

Source: http://www.ertl.jp/~takayuki/readings/info/no05.html

Source code

endian.c

/*endianness endianness*/
/*Examine the endianness of int type*/

#include <stdio.h>
#include <stdlib.h>

int main(void) {
    int i = 1;
    
    if(*((char *)&i))
    {
        printf("little-endian\n");
    }
    //i char*Cast to int-True if the value obtained by shifting the pointer reference destination by one size is ≠ 0
    else if(*((char *)&i + (sizeof(int) - 1)))
    {
        printf("big-endian\n");
    }
    else
    {
        printf("unknown\n");
    }

    return EXIT_SUCCESS;
}

Execution result

The result was that it was little endian.

result.txt(Any)

Success #stdin #stdout 0s 4380KB

little-endian