关于ispunct()函数的问题？帮看下谢谢！

[zhuyike]

#include<iostream>
#include<string>
using namespace std;
int main()
{
string s1;
cin>>s1;
for(string::size_type index=0;index!=s1.size();++index)
{
if(ispunct(s1[index]))
{
for(;index!=s1.size();++index)
s1[index]=s1[index+1];
}
}
cout<<s1<<endl;
return 0;
}
代码的功能是要实现去掉字符串中的标点符号，但好像if语句执行不了..？大哥哥们帮个忙看下哪出错了！！

[星羽]

给你个更简洁的

#include <iostream> 
#include <string> 
#include <algorithm>
using namespace std; 

int main() 
{ 
    string s1; 
    cin>>s1;

    s1.erase(remove_if(s1.begin(), s1.end(), ispunct), s1.end());

    cout<<s1<<endl; 
    return 0; 
} 

[fengying616]

#include <iostream> 
#include <string> 
using namespace std; 
int main(){ 
   string s1; 
   cin>> s1; 
   for(string::size_type index=0;index!=s1.size();){
    if(ispunct(s1[index])){
	string::size_type i;
        for(i=index;i!=s1.size()- 1 && s1[i]!='\0';++i)
          s1[i]=s1[i+1];
	s1[i]='\0';		
      }else{
             ++index;
            }
    }
 cout <<s1 <<endl; 
 system("Pause");
 return 0; 
} 

[fengying616]

要注意同时出现两个或更多标点符号的情况。

[ZiSheng]

顶,就是在出现标点符号的时间,后面的字符向后移动

[laolaoliu2002]

大家手好快,我看到的时候已经被回答,郁闷ing.

[dubiousway]

#include <iostream> 
#include <string> 
using namespace std; 
int main() 
{ 
string s1; 
cin>> s1; 
char ch=s1[0];
for(string::size_type index=0;index!=s1.size();++index) 
{ 
if(ispunct(s1[index])) 
{ 
for(string::size_type index2= index;index2!=s1.size()-1;++index2) 
s1[index2]=s1[index2+1]; 
s1.resize(s1.size()-1);
} 

} 
cout <<s1 <<endl; 
return 0; 
} 

[星羽]

#include <iostream> 
#include <string> 
using namespace std; 

int main() 
{ 
    string s1; 
    cin>>s1; 

    for (string::size_type index = 0; index < s1.size(); ++index) 
    { 
        if (ispunct(s1[index])) 
        { 
            for (string::size_type j = index; j < s1.size(); ++j) 
                s1[j] = s1[j + 1]; 
        } 
    } 
    cout<<s1<<endl; 
    return 0; 
}