C言語おさらい（自分用）

README.md

Run

$ gcc -o app main.c
$ ./app
16975631        16975631        1807    15
15
7
3
1
15
7
3
1
15
7
3
1

main.c

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

void fn(char *a, int len) {
        for (int i = 0; i < len; i++) {
                printf("%d\n", a[i]);
        }
}

int main(void) {
        //                   1       3       7      15
        int     i = 0b00000001000000110000011100001111;
        int   *p1 = &i;
        short *p2 = (short *)p1;
        char  *p3 = (char *)p1;

        printf("%d\t%d\t%d\t%d\n", i, *p1, *p2, *p3);

        for (int y = 0; y < 4; y++) {
                printf("%d\n", *(p3+y));
        }

        for (int y = 0; y < 4; y++) {
                printf("%d\n", p3[y]);
        }

        fn(p3, 4);

        return EXIT_SUCCESS;
}