1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

struct Point {
    int x;
    int y;
    char* name;
};

void print_point(char* label, struct Point p) {
    printf("%s: x== %d    y == %d    name == \"%s\"\n", label, p.x, p.y, p.name);
}

int main(int argc, char* argv[]) {
    struct Point p = { .name = "ARMS 1010", .x = 10, .y = 10 };
                //   └─────────────────┬─────────────────────┘
                //            named initializer
    
    print_point("before", p);

    p = (struct Point*) { .name = "BHEE 170", .x = 1, .y = 70 };
    //  └────────────────────────────┬───────────────────────┘
    //                       compound literal
    //
    // CAUTION:  type of a compound literal will never have a '*'.
    // p = (struct Point*) { .name = "BHEE 170", .x = 1, .y = 70 };
    //                  ▲
    //                  do not try to use an address type here
    //
    // GCC ERRORS:  "field name not in record or union initializer"
    //              "initialization of 'struct Point *' from incompatible … type 'char *'"
    //
    print_point("after ", p);

    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */

© Copyright 2024 Alexander J. Quinn         This content is protected and may not be shared, uploaded, or distributed.