C++ primer ——3.2.3节

//3.6
#include<iostream>
#include<string>
#include<cctype>
using std::string;
using std::cout;

int main()
{
string s("hello");
for (int index = 0; index < s.size(); index++)
s[index] = 'T';
cout << s;
return 0;
}

//3.10
#include<iostream>
#include<string>
using std::cout;
using std::string;
using std::endl;
int main()
{
string s("hello,world !");
for (string::size_type index = 0; index < s.size(); index++)
{
if (ispunct(s[index]))
{
string::size_type n = index;
for (; n < s.size() - 1;n++)
s
= s[n + 1];

}

cout << s[index] << endl;

}
cout << s;
return 0;
}//用数组存在BUG如何解决

#include<iostream>
#include<string>
using std::cout;
using std::string;

int main()
{
string s("hello,world!");
for (auto c : s)
{
if (!ispunct(c))
{
cout << c;
}
}
return 0;
}