CODEWITHSUNDEEP
c++console-application
user1765737
user1765737

Reputation: 33

C++, user input check for '\0' stops at spaces?

If the user inputs a sentence containing spaces the while loop stops at one of these spaces. Why is this happening? are '\0' and a space the same or did i do something else wrong?

int main ( )
{
    char user_input[200];
    cin>>user_input;
    int i=0;
    while(user_input[i]!='\0')
    {
        i++;
    }
    cout<<i;
    return 1;

}

Thanks everyone, I appreciate your help.

Upvotes: 3

Views: 2498

Answers (3)

LAP
LAP

Reputation: 132

This is because your input stops reading when white space is entered. You can use

cin.unsetf(ios::skipws)

By default it is set to skip white spaces. With this you will get your desired result.

Upvotes: 1

Alex Wilson
Alex Wilson

Reputation: 6740

This is an issue with reading using >> into a char array. It splits at whitespace when tokenizing. Try printing user_input to screen to confirm this.

Using getline into a std::string is generally safer in this context (as mentioned by daknøk). And I assume the input is likely to be terminated by a carriage return?

std::string user_input;
std::getline( std::cin, user_input, '\n' );

Upvotes: 3

Coding Mash
Coding Mash

Reputation: 3346

\0 is the null terminating character with ASCII code 0. Space is another character with ASCII 32 i suppose. In fact you are doing this.

cin >> user_input;

It takes input till you press space or enter. So no space is present in your user_input string. Use this instead of cin.

cin.getline (user_input, 200, '\0') ;

Upvotes: 9

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