CODEWITHSUNDEEP
c++stringstlstd
tr0yspradling
tr0yspradling

Reputation: 604

C++ remove whitespace

I have this code to remove whitespace in a std::string and it removes all characters after the space. So if I have "abc def" it only returns "abc". How do I get it to go from "abc def ghi" to "abcdefghi"?

#include<iostream>
#include<algorithm>
#include<string>

int main(int argc, char* argv[]) {
    std::string input, output;
    std::getline(std::cin, input);

    for(int i = 0; i < input.length(); i++) {
        if(input[i] == ' ') {
            continue;
        } else {
            output += input[i];
        }
    }
    std::cout << output;
    std::cin.ignore();
}

Upvotes: 9

Views: 30608

Answers (5)

Vyas Ramankulangara
Vyas Ramankulangara

Reputation: 728

ifstream ifs(filename);
string str, output;
vector<string> map;
while (getline(ifs, str, ' ')) {
    map.push_back(str);
}
for(int i=0; i < map.size();i++){
    string dataString = map[i];
    for(int j=0; j < dataString.length(); j++){
        if(isspace(dataString[j])){
            continue;
        }
        else{
            output +=dataString[j];
        }
    }
}

Upvotes: -1

Aleksandar
Aleksandar

Reputation: 4144

My function for removing a character is called "conv":

#include <cstdlib>
#include <iostream>
#include <string>

using namespace std;

string conv(string first, char chr)
{
    string ret,s="x";
    for (int i=0;i<first.length();i++)
    {
        if (first[i]!=chr)
        s=s+first[i]; 
    }
    first=s;
    first.erase(0,1);
    ret=first;
    return ret;
    }
int main()
{
    string two,casper="testestestest";
    const char x='t';
    cout<<conv(casper,x);
    system("PAUSE");
    return 0;
}

You need to change the const char x to ' ' (whitespace, blanco) for the job to be done. Hope this helps.

Upvotes: 1

Vijay
Vijay

Reputation: 67211

Well the actual problem you had was mentioned by others regarding the cin >> But you can use the below code for removing the white spaces from the string:

str.erase(remove(str.begin(),str.end(),' '),str.end());

Upvotes: 13

Ry-
Ry-

Reputation: 224857

The issue is that cin >> input only reads until the first space. Use getline() instead. (Thanks, @BenjaminLindley!)

Upvotes: 9

Jerry Coffin
Jerry Coffin

Reputation: 490048

Since the >> operator skips whitespace anyway, you can do something like:

while (std::cin>>input)
    std::cout << input;

This, however, will copy the entire file (with whitespace removed) rather than just one line.

Upvotes: 3

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