c99ish.c

/* Silly little test file for some popular C99 features:
 * - C++-style comments
 * - variadic macros
 * - 'static inline'
 * - within-block variable declarations
 * - designated initializers
 * - stdint.h
 * - stdbool.h
 *
 * Copyright (C) 2016 Nathaniel Smith <njs@pobox.com>
 * Licensed under BSD-2 or MIT or Apache 2.0 at your option.
 */

#include <stdio.h>
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>

// C++-style comment?

#define variadic_printf(...) fprintf(stdout, __VA_ARGS__)

/* static inline -- this is only one of several 'inline' variants supported by
 * c99, but I think it's the only one we care about?
 */
static inline int add(int a, int b)
{
    return a + b;
}

int main(int argc, char** argv)
{
    variadic_printf("variadic macros: %s\n", "seem to work");

    assert(add(1, 2) == 3);

    /* within-block variable declarations */
    int i = 1;

    /* designated array initializers */
    int arr[4] = { [2] = 2, [1] = 1 };
    assert(arr[0] == 0);
    assert(arr[1] == 1);
    assert(arr[2] == 2);
    assert(arr[3] == 0);

    struct point
    {
        int x, y, z;
    } point = { .y = 2, .x = 1 };
    assert(point.x == 1);
    assert(point.y == 2);
    assert(point.z == 0);

    /* stdint.h */
    assert(sizeof(int32_t) == 4);

    bool b = true;
    assert(b != false);
    b = 10;
    assert(b == 1);

    printf("Looks good!\n");
    return 0;
}