CODEWITHSUNDEEP
c++
ZeeZeeZee
ZeeZeeZee

Reputation: 73

Is there a simple way to check if cin input has a space?

Say i have something like this int s and cin >> s. Is there a simple way to test if user input for 's' is a white space without resorting to isspace which would result in first converting that int to a string and then back to an int again after my test.

Upvotes: 0

Views: 2078

Answers (2)

ravi
ravi

Reputation: 10733

If you do:-

int s;
cin >> s;

It won't even return on entering whitespace. User has to enter some non-whitespace character.

Upvotes: 1

Christian Hackl
Christian Hackl

Reputation: 27528

Use the std::getline function to get a whole line of input as a std::string, then parse the line, which can be as easy as using std::stoi in C++11:

std::string input;
std::getline(input, input, std::cin);
int const s = std::stoi(input);

It will check the input for validity and throw an exception if no conversion can be performed. Additionally, having the input available as a std::string, you can perform any checking you like, and it's trivial to check the existence of a particular character in a string.

Upvotes: 3

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