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/* Initialization of local variables */
#include <stdio.h>
static void print_chars(char * s, int sz)
{
int i;
for (i = 0; i < sz; i++) {
if (s[i] >= 32 && s[i] < 127)
printf("'%c', ", s[i]);
else
printf("%d, ", s[i]);
}
}
/* Initialization of local const array */
int f(int x, int y)
{
const int dfl = 2;
const int tbl[3] = { y, y + 1, y + 2 };
return tbl[x >= 0 && x < 3 ? x : dfl];
}
struct P { int x, y; };
struct S {
int tag;
struct P a;
union {
struct P b;
char c[8];
} u;
};
static void print_S(char * name, struct S * s)
{
printf("%s = { tag = %d, a = {%d,%d}, u = ", name, s->tag, s->a.x, s->a.y);
switch(s->tag) {
case 0:
printf("{%d,%d} }\n", s->u.b.x, s->u.b.y);
break;
case 1:
printf("{"); print_chars(s->u.c, 8); printf("} }\n");
break;
default:
printf("BAD }\n");
break;
}
}
int main()
{
/* Initialization of arrays */
const int x5[10] = { 1, 2, 3 };
char x17[] = "Hello!";
char * x18 = "Hello!";
char * x19[2] = { "Hello", "world!" };
char x20[3] = "Hello!";
char x21[10] = "Hello!";
printf("x5 = { ");
for (int i = 0; i < 10; i++) printf("%d, ", x5[i]);
printf("}\n");
printf("x17[%d] = { ", (int) sizeof(x17));
print_chars(x17, sizeof(x17));
printf("}\n");
printf("x18 = \"%s\"\n", x18);
printf("x19 = { \"%s\", \"%s\" }\n", x19[0], x19[1]);
printf("x20 = { ");
print_chars(x20, sizeof(x20));
printf("}\n");
printf("x21 = { ");
print_chars(x21, sizeof(x21));
printf("}\n");
/* Local const arrays */
printf("f(0,42) = %d, f(1,42) = %d, f(2,42) = %d, f(3,42) = %d, f(4,42) = %d\n",
f(0,42), f(1, 42), f(2, 42), f(3, 42), f(4, 42));
/* Structs/unions */
struct P p1 = { 66, 77 };
struct S s1 = { 0, p1 };
print_S("s1", &s1);
struct S s2 = { .a.y = 1, .u.c[4] = 'x', .u.b = p1 };
print_S("s2", &s2);
struct S s3 = { .tag = 1, .a = p1, .a.x = 1, .u.c = "Hello!", .u.c[7] = 'X' };
print_S("s3", &s3);
struct S s4 = { .tag = 0, .a.x = 1, .a = p1, .u.b = 88, 99 };
print_S("s4", &s4);
return 0;
}
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