isalpha() function not working for spaces in string

Question

I wrote a code so that it removes everything(like spaces and other things) other than the alphabats using isalpha() function and converts it to lower case using tolower() function. It is working fine if i don't put a space in the string but if there is any space in the string then it go beyond the space. I dont understand why this is happening. This is the code i wrote.

#include<bits/stdc++.h>
#include<cstring>
#include<cctype>
using namespace std;
int main()
{
    int i;
    string A,b="";
    cin>>A;
    for(i=0;i<A.size();i++)
    {
        if(isalpha(A[i]))
        b+= tolower(A[i]);
        
        else
        continue;
        
    }
    cout<<b;
}

Please help me. Thankyou

What is the input for which it is failing? What is the output you are getting on that test case ? What is the expected output? — Deepak Patankar, Jul 23 '20 at 05:31
Add this line `cout << A << '\n';` Then you might understand what is happening — john, Jul 23 '20 at 05:34
Like i give input= "adhGHt//'[]\Klj hyjc//ghDf" then it will return output as adhghtklj instead of returning adhghtkljhyjcghdf — purple_tulip, Jul 23 '20 at 09:43
This doesn't address the question, but that `else continue;` can be removed. It doesn't do anything. — Pete Becker, Jul 23 '20 at 13:35

score 5 · Answer 1 · answered Jul 23 '20 at 05:31

5

The cin >> A; considers the space to terminate the input.

To get the whole line, use getline(cin, A);

answered Jul 23 '20 at 05:31

Jiří Baum

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Deepak Patankar · Answer 2 · 2020-07-23T05:47:59.163

4

cin reads the string till the first space it encounters, if your input string is "Hello World", then cin will only read "Hello".

You can use getline function to read a complete line.

edited Jul 23 '20 at 05:47

answered Jul 23 '20 at 05:34

Deepak Patankar

3,076
3
16
35

isalpha() function not working for spaces in string

2 Answers2