How to delete characters in a string? - c++

Question

I am trying to write a program hat removes the character 'p' in Pineapple to output the word Pineale. Here is my current code. I found similar problems to this and thought this code would work but it is not unfortunately. Any help is appreciated!
#include <iostream>
#include <algorithm>
#include <string>
#include <cstdlib>
#include <limits>
using namespace std;
int main(){
remove(c,s);
}
string remove(char c, const string & s){
string s = "Pineapple";
char chars[] = "p";
for (unsigned int i = 0; i < strlen(chars); ++i)
{
s.erase(remove(s.begin(), s.end(), chars[i]), s.end());
}
cout << s << endl;
return s;
}

Answer 1

First, you did not define any c or s variables.
Second, your parameter in remove function is const, that means s is unchangeable.
The code below works in my VS2013.
#include "stdafx.h"
#include <iostream>
#include <algorithm>
#include <string>
#include <cstdlib>
#include <limits>
using namespace std;
string remove(char* charToRemove, string &str){
//string s = "Pineapple";
//char chars[] = "p";
for (unsigned int i = 0; i < strlen(charToRemove); ++i)
{
str.erase(remove(str.begin(), str.end(), charToRemove[i]), str.end());
}
cout << str << endl;
return str;
}
int _tmain(int argc, _TCHAR* argv[])
{
string str("Pineapple");
char chars[] = "p";
remove(chars, str);
int i;
cin >>i;
}

Answer 2

Simply get the position of first 'p' from "Pineapple" using string::find(), then use string::erase(). No need to put string::erase() inside the loop.
string remove(char to_rem, string s) {
size_t pos = s.find( to_rem );
s.erase(pos, count(s.begin(), s.end(), to_rem) );
return s;
}
Modified code:
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
string remove(char to_rem, string s) {
size_t pos = s.find( to_rem );
s.erase(pos, count(s.begin(), s.end(), to_rem) );
return s;
}
int main() {
cout << remove('p', "Pineapple");
}
Output:
Pineale

Answer 3

Try this:
struct slash_pred
{
char last_char;
slash_pred()
: last_char( '\0' ) // or whatever as long as it's not '/'
{
}
bool operator()(char ch)
{
bool remove = (ch == '/') && (last_char == '/');
last_char = ch;
}
};
path.erase( std::remove_if( path.begin(), path.end(),
slash_pred() ), path.end() );