Remove All Blank Spaces in a String

“Remove All Blank Spaces in a String” is  again a basic problem of string data structure. Here, we are given a string of length ‘n’ and our task is to remove the blank spaces from the string.

Example:

INPUT:
Help Me Study Bro
OUTPUT:
HelpMeStudyBro

The steps required to Remove All Blank Spaces in a String are as follows:

1. Iterate the string and check whether the character is blank space or not.
2. If the character is blank space, then move all the subsequent characters one position back. Then delete the last character of the string.
3. If the character is not blank space character, continue iterating the string.

C++ Program to Remove All Blank Spaces in a String is as follows:

/* Program to Remove All Blank Spaces in a String */
#include<bits/stdc++.h>
#define size 1000  
using namespace std;  
int main()  
{  
    char str[size];  
    cout<<"Enter a string:\n";  
    cin.getline(str,size);  
    cout<<"Before Removing Spaces:\n";  
    cout<<str;  
    /* Iterate over the complete string */  
    for(int i = 0; i < size && str[i] != '
/* Program to Remove All Blank Spaces in a String */
#include<bits/stdc++.h>
#define size 1000  
using namespace std;  
int main()  
{  
char str[size];  
cout<<"Enter a string:\n";  
cin.getline(str,size);  
cout<<"Before Removing Spaces:\n";  
cout<<str;  
/* Iterate over the complete string */  
for(int i = 0; i < size && str[i] != '\0'; i++)  
{  
/* If character is blank space, move the  
subsequent character one position back */  
if(str[i] == ' ')  
{  
int j;  
for(j = i; j < size && str[j] != '\0'; j++)  
{  
str[j] = str[j+1];  
}  
/* Remove the last character, by  
putting NULL character in the last*/  
str[j-1] = '\0';  
}  
}  
cout<<"\nAfter Removing Spaces:\n";  
cout<<str;  
}  
'; i++)  
    {  
        /* If character is blank space, move the  
           subsequent character one position back */  
        if(str[i] == ' ')  
        {  
            int j;  
            for(j = i; j < size && str[j] != '
/* Program to Remove All Blank Spaces in a String */
#include<bits/stdc++.h>
#define size 1000  
using namespace std;  
int main()  
{  
char str[size];  
cout<<"Enter a string:\n";  
cin.getline(str,size);  
cout<<"Before Removing Spaces:\n";  
cout<<str;  
/* Iterate over the complete string */  
for(int i = 0; i < size && str[i] != '\0'; i++)  
{  
/* If character is blank space, move the  
subsequent character one position back */  
if(str[i] == ' ')  
{  
int j;  
for(j = i; j < size && str[j] != '\0'; j++)  
{  
str[j] = str[j+1];  
}  
/* Remove the last character, by  
putting NULL character in the last*/  
str[j-1] = '\0';  
}  
}  
cout<<"\nAfter Removing Spaces:\n";  
cout<<str;  
}  
'; j++)  
            {  
                str[j] = str[j+1];  
            }  
            /* Remove the last character, by  
               putting NULL character in the last*/  
            str[j-1] = '
/* Program to Remove All Blank Spaces in a String */
#include<bits/stdc++.h>
#define size 1000  
using namespace std;  
int main()  
{  
char str[size];  
cout<<"Enter a string:\n";  
cin.getline(str,size);  
cout<<"Before Removing Spaces:\n";  
cout<<str;  
/* Iterate over the complete string */  
for(int i = 0; i < size && str[i] != '\0'; i++)  
{  
/* If character is blank space, move the  
subsequent character one position back */  
if(str[i] == ' ')  
{  
int j;  
for(j = i; j < size && str[j] != '\0'; j++)  
{  
str[j] = str[j+1];  
}  
/* Remove the last character, by  
putting NULL character in the last*/  
str[j-1] = '\0';  
}  
}  
cout<<"\nAfter Removing Spaces:\n";  
cout<<str;  
}  
';  
        }  
    }  
    cout<<"\nAfter Removing Spaces:\n";  
    cout<<str;  
}  

OUTPUT:
Enter a string: Help Me Study Bro
Before Removing Spaces: Help Me Study Bro
After Removing Spaces: HelpMeStudyBro
Time Complexity:
O(n^2)

C++ Program to Remove All Blank Spaces in a String is as follows:

/* Program to Remove All Blank Spaces in a String */
#include<bits/stdc++.h>  
using namespace std;  
int main()  
{  
    string str;  
    cout<<"Enter a string:\n";  
    getline(cin,str);  
    cout<<"\nBefore Removing Spaces: ";  
    cout<<str;  
     /* Iterate over the complete string */  
    for(int i = 0; i <  str.length(); i++)  
    {  
        if(str[i] == ' ')  
        {  
           /* If character is blank space, move the  
           subsequent character one position back */  
            for(int j = i; j <  str.length(); j++)  
            {  
                str[j] = str[j+1];  
            }  
            /* Remove the last character, by  
             popping out last character of the string*/  
            str.pop_back();  
        }  
    }  
    cout<<"\nAfter Removing Spaces: ";  
    cout<<str;  
}  

OUTPUT:
Enter a string: Help Me Study Bro
Before Removing Spaces: Help Me Study Bro
After Removing Spaces: HelpMeStudyBro
Time Complexity:
O(n^2)

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