```
bool isPalindrome(string s) {
int n = s.length();
string t =s;
for(int i=0;i<t.length();i++){
if(t[i] == ' '){t.erase(i,1);i--;}
}
```

// I put the above for loop to first erase all the space ONLY to check for the case where it could only be space

// Is there a function which checks if all the characters are space, then I need no do it. Please let me know.

```
if(t.length()==0){return true;}
```

// Here, after removing space, I am checking of length is 0, is so, all was space. //

```
int i=0;
int j = t.length()-1;
// Here I am simply checking from front and end and ignoring non - alpha numeric.
while(i<j){
if(!isalnum(t[i])){i++;continue;}
if(!isalnum(t[j])){j--;continue;}
if( (t[i]==t[j]) || ( toupper(t[i]) == toupper(t[j]) )){i++;j--;}
else { return false;}
}
return true;
```

// So please let me know how to check for space without removing the spaces and then checking.