#!./main

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <assert.h>

int x = 21;

int baz(int xx, ...) { return 42; }

int foo(void) { return x + x; }

char *bar(void) { return "bye bye"; }

struct Point { float x, y; };

struct Point pt;

float Point_magnitude(struct Point p) { return sqrtf(p.x * p.x + p.y * p.y); }

int gbl[5];

int gg[] = { -2, ~2, !2, 6+7, 6*7 };

int main(int argc, char **argv)
{
    printf("hello, world %d %s\n", foo(), bar());
    printf("baz is %d %d %d\n", baz(1), baz(1, 2), baz(1, "two", 3));
    printf("%d\n", 6*7);
    int x  = 42;
    int *p = &x;
    printf("x is %d p is %p\n", *p, p);
    *p = 666;
    printf("x is %d %d\n", x, *p);
    x = 123;
    printf("x is %d %d\n", x, *p);
    for (x = 0; x < 10; ++x) {
	if (x == 5) printf("%%");
	printf("%d ", x);
    }
    printf("\n");
    while (x > 0) printf("%d ", --x);
    printf("\n");
    printf("%d\n", sizeof(char *));

    int i, array[5] = { 2, 3, 5, 7, 11 };
    printf("array size %d\n", sizeof(array));
    for (i = 0;  i < 5;  ++i) printf("%d\n", array[i]);
    for (i = 0;  i < 5;  ++i) array[i] = i*i;
    for (i = 0;  i < 5;  ++i) printf("%d\n", array[i]);

    for (i = 0;  i < 5;  ++i) array[i] = array[i] * array[i];
    for (i = 0;  i < 5;  ++i) printf("%d\n", array[i]);

    printf("%p\n", array);
    printf("%p\n", array + 10);
    p = array;
    printf("%p\n", p);
    printf("%p\n", array+5);

    while (p < array+5) printf("%d\n", *p++);

    printf("%p\n",  array);
    printf("%p\n", &array);
    printf("%p\n", &array[0]);

    assert(array     == &array);
    assert(array     == &array[0]);
    assert(&array    == array);
    assert(&array[0] == array);

    char *sliteral  = "string literal";
    char sarray[]   = "string array";
    char tarray[13] = "string array";
    char uarray[20] = "string array";
    char varray[12] = "string array";

    printf("%zd %s\n", sizeof(sliteral), sliteral);
    printf("%zd %s\n", sizeof(sarray), sarray);
    printf("%zd %s\n", sizeof(tarray), tarray);
    printf("%zd %s\n", sizeof(uarray), uarray);
    printf("%zd %s\n", sizeof(varray), uarray); // varray has unterminated string

    printf("gbl %f %f -> %f\n", pt.x, pt.y, Point_magnitude(pt)); // global data is filled with zero
    pt.x = 3.0;
    pt.y = 4.0;
    printf("gbl %f %f -> %f\n", pt.x, pt.y, Point_magnitude(pt));

    struct Point qt;
    printf("lcl %f %f -> %f\n", qt.x, qt.y, Point_magnitude(qt)); // local data is random
    qt.x = 3.0;
    qt.y = 4.0;
    printf("lcl %f %f -> %f\n", qt.x, qt.y, Point_magnitude(qt));

    struct Point rt = { 5.0, 12.0 };
    printf("%f %f -> %f\n", rt.x, rt.y, Point_magnitude(rt));

    for (i = 0;  i < 5;  ++i) printf("g %d\n", gbl[i]); // global data is filled with zero
    int lcl[5];
    for (i = 0;  i < 5;  ++i) printf("l %d\n", lcl[i]); // local data is random

    int ll[] = { -2, ~2, !2, 6+7, 6*7 };

    for (i = 0;  i < sizeof gg / sizeof(int);  ++i) printf("g %d ", gg[i]);    printf("\n");
    for (i = 0;  i < sizeof ll / sizeof(int);  ++i) printf("l %d ", ll[i]);    printf("\n");

    printf("passed\n");

    return 0;
}

// Local Variables:
// mode: c
// End: