Страустрап Бьярн
Шрифт:
{
if (i‹0 || sz‹=i) error("vector index out of range");
return v[i];
}
vector::~vector
{
delete v;
}
// 1.14
class Vec: public vector {
public:
Vec(int s): (s) {}
Vec(Vec&);
~Vec {}
void operator=(Vec&);
void operator*=(Vec&);
void operator*=(int);
};
Vec::Vec(Vec& a): (a.size)
{
int sz = a.size;
for (int i = 0; i‹sz; i++) elem(i) =a.elem(i);
}
void Vec::operator=(Vec& a)
{
int s = size;
if (s != a.size) error("bad vector size for =");
for (int i =0; i‹s; i++) elem(i)=a.elem(i);
}
Vec operator+(Vec& a, Vec& b)
{
int s = a.size;
if (s!= b.size) error("bad vector size for +");
Vec sum(s);
for (int i=0; i‹s; i++)
sum.elem(i) = a.elem(i) + b.elem(i);
return sum;
}
void error(char* p)
{
cerr ‹‹ p ‹‹ "\n";
exit (1);
}
void vector::set_size(int) {}
main
{
Vec a(10);
Vec b(10);
for (int i=0; i‹a.size; i++) a[i] = i;
b = a;
Vec c = a+b;
for (i=0; i‹c.size; i++) cout ‹‹ c[i] ‹‹ "\n";
}
b1__16.cxx
#include ‹vector.hxx›
declare(vector,int);
implement(vector,int);
main
{
vector(int) vv(10);
vv[2] = 3;
vv[10] = 4; // range error
}
b2_1_3.cxx
#include ‹stream.hxx›
int a = 1;
void f
{
int b = 1;
static int c = 1;
cout ‹‹ " a = " ‹‹ a++
‹‹ " b = " ‹‹ b++
‹‹ " c = " ‹‹ c++ ‹‹ "\n";
}
main
{
while (a ‹ 4) f;
}
b2_3.cxx
#include ‹stream.hxx›
main
{
int* p = new int;
cout ‹‹ "sizeof(int) = " ‹‹ sizeof(int) "\n";
}
b2_3_6a.cxx
#include ‹stream.hxx›
extern int strlen(char*);
char alpha[] = "abcdefghijklmnopqrstuvwxyz";
main
{
int sz = strlen(alpha);
for (int i=0; i‹sz; i++) {
char ch = alpha[i];
cout ‹‹ "'" ‹‹ chr(ch) ‹‹ "'"
‹‹ " = " ‹‹ ch
‹‹ " = 0" ‹‹ oct(ch)
‹‹ " = 0x" ‹‹ hex(ch) ‹‹ "\n";
}
}
b2_3_6b.cxx
#include ‹stream.hxx›
char v[2][5] = {
'a', 'b', 'c', 'd', 'e',
'0', '1', '2', '3', '4'
};
main {
for (int i = 0; i‹2; i++) {