CodeIQ Q431 Restricted Words。リテラルを使わずに「Hello World」を出力する。整数拡張を忘れていて int ではなく char を使っていたり、変数に格納している数値が中途半端だったり、改めて見ると粗が目立つ。

codeiq-q431.c

#include <stdio.h>

int
main(void) {
    char one = sizeof(char); /* is 1 by definition */
    char zero = one >> one;
    char two = one << one;
    char four = two << one;
    char five = four | one;
    char six = four | two;
    char eight = four << one;

    char LF = eight | two; /* 0x10 */
    char SP = one << five; /* 0x20 */
    char H = (one << six) | eight; /* 0x48 */
    char W = (one << six) | (one << four) | four | two | one; /* 0x57 */
    char d = (one << six) | (one << five) | four; /* 0x64 */
    char e = (one << six) | (one << five) | four | one; /* 0x65 */
    char l = (one << six) | (one << five) | eight | four; /* 0x6c */
    char o = (one << six) | (one << five) | eight | four | two | one; /* 0x6f */
    char r = (one << six) | (one << five) | (one << four) | two; /* 0x72 */

    putchar(H);
    putchar(e);
    putchar(l);
    putchar(l);
    putchar(o);

    putchar(SP);

    putchar(W);
    putchar(o);
    putchar(r);
    putchar(l);
    putchar(d);

    putchar(LF);

    return zero;
}