Страустрап Бьярн
Шрифт:
for (int j = 0; j ‹5; j++)
cout ‹‹ "v[" ‹‹ i ‹‹ "][" ‹‹ j
‹‹ "]=" ‹‹ chr(v[i][j]) ‹‹ " ";
cout ‹‹ "\n";
}
}
b2_3_7.cxx
#include ‹stream.hxx›
main
{
char cv[10];
int iv[10];
char* pc = cv;
int* pi = iv;
cout ‹‹ "char* " ‹‹ long(pc+1)-long(pc) ‹‹ "\n";
cout ‹‹ "int* " ‹‹ long(pi+1)-long(pi) ‹‹ "\n";
}
b2_3__10.cxx
#include ‹stream.hxx›
struct pair {
char* name;
int val;
};
extern int strlen(char*);
extern int strcpy(char*, char*);
extern int strcmp(char*, char*);
const large = 1024;
static pair vec[large];
pair* find(char* p)
{
for (int i=0; vec[i].name; i++)
if (strcmp(p,vec[i].name)==0) return &vec[i];
if (i == large) return &vec[large-1];
return &vec[i];
}
int& value(char* p)
{
pair* res = find(p);
if (res-›name == 0) {
res-›name = new char[strlen(p)+1];
strcpy(res-›name,p);
res-›val = 0;
}
return res-›val;
}
const MAX = 256;
main
{
char buf [MAX];
while (cin››buf) value(buf)++;
for (int i=0; vec[i].name; i++)
cout ‹‹ vec[i].name ‹‹ ":" ‹‹ vec[i].val ‹‹ "\n";
}
b3_1all.cxx
#include ‹xstream.hxx›
#include ‹ctype.h›
enum token_value {
NAME, NUMBER, END,
PLUS = '+', MINUS = '-', MUL='*', DIV='/',
PRINT=';', ASSIGN='=', LP='(', RP=')'
};
token_value curr_tok;
struct name {
char* string;
name* next;
double value;
};
const TBLSZ = 23;
name* table[TBLSZ];
int no_of_errors;
double error(char* s) {
cerr ‹‹ "error: " ‹‹ s ‹‹ "\n";
no_of_errors++;
return 1;
}
extern int strlen(const char*);
extern int strcmp(const char*, const char*);
extern char* strcpy(char*, const char*);
name* look(char* p, int ins = 0)
{
int ii= 0;
char *pp = p;
while (*pp) ii = ii‹‹1 ^ *pp++;
if (ii ‹ 0) ii = -ii;
ii %= TBLSZ;
for (name* n=table [ii]; n; n=n-›next)
if (strcmp(p,n-›string) == 0) return n;
if (ins == 0) error("name not found");
name* nn = new name;
nn-›string = new char[strlen(p) + 1];
strcpy(nn-›string,p);
nn-›value = 1;
nn-›next = table[ii];
table[ii] = nn;
return nn;
}
inline name* insert(char* s) { return look (s,1); }
token_value get_token;