Removing spaces from a string using Stringstream

Difficulty Level : Easy
Last Updated : 19 Feb, 2020

Solution to removing spaces from a string is already posted here. In this article another solution using stringstream is discussed.

Algorithm

1. Enter the whole string into stringstream.
2. Empty the string.
3. Extract word by word and concatenate to the string.

Program 1: Using EOF.

// C++ program to remove spaces using stringstream 
#include <bits/stdc++.h> 
using namespace std; 
  
// Function to remove spaces 
string removeSpaces(string str) 
{ 
    stringstream ss; 
    string temp; 
  
    // Storing the whole string 
    // into string stream 
    ss << str; 
  
    // Making the string empty 
    str = ""; 
  
    // Running loop till end of stream 
    while (!ss.eof()) { 
  
        // Extracting word by word from stream 
        ss >> temp; 
  
        // Concatenating in the string to be 
        // returned 
        str = str + temp; 
    } 
    return str; 
} 
  
// Driver function 
int main() 
{ 
    // Sample Inputs 
    string s = "This is a test"; 
    cout << removeSpaces(s) << endl; 
  
    s = "geeks for geeks"; 
    cout << removeSpaces(s) << endl; 
  
    s = "geeks quiz is awsome!"; 
    cout << removeSpaces(s) << endl; 
  
    s = "I love     to     code"; 
    cout << removeSpaces(s) << endl; 
  
    return 0; 
} 

Output:

Thisisatest
geeksforgeeks
geeksquizisawsome!
Ilovetocode

Program 2: Using getline().

// C++ program to remove spaces using stringstream 
// and getline() 
#include <bits/stdc++.h> 
using namespace std; 
  
// Function to remove spaces 
string removeSpaces(string str) 
{ 
    // Storing the whole string 
    // into string stream 
    stringstream ss(str); 
    string temp; 
  
    // Making the string empty 
    str = ""; 
  
    // Running loop till end of stream 
    // and getting every word 
    while (getline(ss, temp, ' ')) { 
        // Concatenating in the string 
        // to be returned 
        str = str + temp; 
    } 
    return str; 
} 
// Driver function 
int main() 
{ 
    // Sample Inputs 
    string s = "This is a test"; 
    cout << removeSpaces(s) << endl; 
  
    s = "geeks for geeks"; 
    cout << removeSpaces(s) << endl; 
  
    s = "geeks quiz is awsome!"; 
    cout << removeSpaces(s) << endl; 
  
    s = "I   love     to     code"; 
    cout << removeSpaces(s) << endl; 
  
    return 0; 
} 
  
// Code contributed by saychakr13 

Output:

Thisisatest
geeksforgeeks
geeksquizisawsome!
Ilovetocode

This article is contributed by Nishant. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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