string

if i have a string that contains a puncuation marks. How do i discard that puncuation mark ?

for example:

programming.

how do i make it into:

programming << exclude the fullstop

Create a loop, and systematically go through each character in the string, looking for a punctuation mark. Then, skip outputting that character, and continue. Like this:

Code:

---

const char * String = "pro.gramming.is.great...";
for (int X=0; String[X] != '\0'; X++)
{
    if (String[X] != '.')
    {
        cout << String[X];
    }
}

---

^ that's a good idea, but I would do it like this:

Code:

---

...
const char*puctuation=".,></?\\\"\':;|[]{}()!@#$%^&*~`-_=+";

int length=strlen(phrase);
int punclength=strlen(punctuation);

for(int x=0;x<length;x++)  //walk through phrase taken in
{
  for(int y=0;y<punclength;y++)  //walk through puncuation defs
  {
      if(phrase[x]==puctuation[y])  //if current char is punctuation
          removechar(phrase,x);  //call function to remove it
  }
}
...

---

Use the remove_if function along with the ispunct function.

Code:

---

#include <string>
#include <algorithm>
#include <iostream>
#include <ctype.h>
using namespace std;

int main()
{
    string str("H.!ell,o' ;Wor?ld:");
    cout << str << endl;
    str.erase(remove_if(str.begin(),str.end(),ispunct),str.end());
    cout << str << endl;
    return 0;
}

---

Output:
H.!ell,o' ;Wor?ld:
Hello World

oh yeah... forgot about the ispucnt function... I used my way because when I wrote it I needed to know what punctuation I was taking out (I needed to keep some of it in)

Better yet, a localized ispunct function.

Code:

---

#include <string>
#include <locale>
#include <algorithm>
#include <functional>

template <typename C>
void remove_punct(std::string &s, const std::locale &loc = std::locale())
{
  s.erase(std::remove_if(str.begin(), str.end(), std::bind2nd(std::ptr_fun(std::ispunct<C>), loc), s.end());
}

---

I'm not entirely sure if this will compile as it is.

Long live C!!!

Code:

---

char * purge(char str[], const char * disc)
{
 char *ret, *p;
    for(p=ret=str;*str!=0; ++str)  {
      bool copy=true;
        for(const char * d =disc; *d != 0; ++d)  {
            if(*d == *str) copy=false;
      }
        if(copy)  {
      *p++=*str;
      }
  }
 *p=0;
 return ret;
}

---