修改程序清单7.7中的3个数组处理函数,使之使用两个指针参数来表示区间.

#include <iostream>
const int Max = 5;
double *fill_array(double *ar , double *limit);
void show_array(const double *ar , double *n);
void revalue(double r , double *ar , double *n);
int main()
{
using namespace std;
double properties[Max];
double *size = fill_array(properties , properties + Max);
show_array(properties , size);
cout << "Enter revaluation factor: ";
double factor;
cin >> factor;
revalue(factor , properties , size);
show_array(properties , size);
cout << "Done.\n";
return 0;
}
double *fill_array(double *ar , double *limit)
{
using namespace std;
double temp;
int i = 0;
double *p;
for(p = ar ; p < limit ; p++ , i++)
{
cout << "Enter value#" << (i + 1) << ": ";
cin >> temp;
if(!cin)
{
cin.clear();
while(cin.get() != '\n')
continue;
cout << "Bad input ; input process terminated.\n";
break;
}
else if(temp < 0)
break;
*p = temp;
}
return p;
}
void show_array(const double *ar , double *n)
{
using namespace std;
int i = 0;
for(const double *p = ar ; p < n ; p++ , i++)
{
cout << "Property #" << (i + 1) << ": $";
cout << *p << endl;
}
}
void revalue(double r , double *ar ,double *n)
{
for(double *p = ar ; p < n ; p++)
*p *= r;
}