Using string as char array

[JackDurden]

How would I delete one char from a string?

string aWord = "question?";

while(aWord[i])
	{
	if(isalpha(aWord[i]))printf ("character %c is alphabetic\n",aWord[i]);
	else
		delete[i]aWord;
    i++;
  }

[VernonDozier]

How would I delete one char from a string?

string aWord = "question?";

while(aWord[i])
	{
	if(isalpha(aWord[i]))printf ("character %c is alphabetic\n",aWord[i]);
	else
		delete[i]aWord;
    i++;
  }

Use the replace function from string:

http://www.cplusplus.com/reference/string/string/replace.html

string aWord = "abcdef";
aWord.replace (3, 1, "");

aWord now contains "abcef";

Edit: Or just use erase:

aWord.erase (3, 1);

Has the same effect.

[Freaky_Chris]

Note you can use find() or find_first_of() etc to get the index of the character youare after.

Chris

[JackDurden]

Well that sort of works but if the char I want to delete/erase is at the end of the string my compiler crashes. I dont understand how to delete/erase a char that is not an alphanumeric type.

int i=0;
 string aWord = "abcdf!";

while(aWord[i])
	{
	if(isalpha(aWord[i]))printf ("character %c is alphabetic\n",aWord[i]);
	else
		aWord.erase (i, 1);
    i++;
  }
  cout<<aWord;

[Laiq Ahmed]

How would I delete one char from a string?

string aWord = "question?";

while(aWord[i])
	{
	if(isalpha(aWord[i]))printf ("character %c is alphabetic\n",aWord[i]);
	else
		delete[i]aWord;
    i++;
  }

I can give you two ways. one through STL & other through using the strings only

string strWord = "Hello, World!";
	string strResult = "";

	for(size_t idx = 0; idx < strWord.size(); ++idx) {
		if (isalpha(strWord[idx])) {
			strResult += strWord[idx];
		}
	}
	cout<< strResult<<endl;

Another Way

string strWord = "Hello, World! Laiq?";
	size_t pos = 0;

	for(size_t idx = 0; idx < strWord.size(); ++idx) {
		if (isalpha(strWord[idx])) {
			strWord[pos] = strWord[idx];
			++pos;
		}
	}
	strWord.resize(pos);

	cout<< strWord <<endl;

Little more tricky.

Check the remove_if (...)

Hope the above techniques might help you in understanding ?

[VernonDozier]

Well that sort of works but if the char I want to delete/erase is at the end of the string my compiler crashes. I dont understand how to delete/erase a char that is not an alphanumeric type.

int i=0;
 string aWord = "abcdf!";

while(aWord[i])
	{
	if(isalpha(aWord[i]))printf ("character %c is alphabetic\n",aWord[i]);
	else
		aWord.erase (i, 1);
    i++;
  }
  cout<<aWord;

Your program ran for me. I don't know what error you got, but if it is an index-out-of-range/segmentation fault error, you may want to change this:

while (aWord[i])

to

while (i < aWord.length ())

That might make a difference, might not. As to your other problem, only increment i if aWord is a letter. erase and replace will cause the indexes to change, so some characters will be skipped if you use erase/replace AND increment i.

[cikara21]

Check the size..

int i=0;
string aWord = "abcdf!";

while(aWord[i])
{
   if(isalpha(aWord[i]))
      printf ("character %c is alphabetic\n",aWord[i]);
   else
   {
	aWord.erase (i, 1);
      //..Is idx > length
       if(i>aWord.size())
          break;
       i--;
   }
   i++;
}
cout<<aWord;