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:
- Iterate the string and check whether the character is blank space or not.
- If the character is blank space, then move all the subsequent characters one position back. Then delete the last character of the string.
- 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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