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cin

 
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cin
pietra
15 Mar, 2007 - 09:09 AM
Post #1

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*sighs* sorry to bother you but for some reason I can't get cin to work properly.

I have this code

CODE

#include <iostream>
#include <string>

int main ()
{
    
    string str;
    std::cout << "enter name: " << std::endl;
    std::cin >> str;    
    std::cout << "hello, " << str << std::endl;
    getchar();
    return 0;
}


And "enter name" is printed, as soon as I type something (text) and press enter program finishes.

if I change std::cin >> str; with getline(cin, str); it's working. I think it's trivial mistake, but I don't get it, huh.gif
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Amadeus
RE: Cin
15 Mar, 2007 - 09:19 AM
Post #2

g++ -o drink whiskey.cpp
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It's not a mistake, so no worries there.

1. the cin >> stream operator only takes up to the first whitespace.
2. Even if the input is one word, the cin stream operator does NOT take the newline character (inserted by the return key) into the variable. this means that the newline character is still in the stream. when you call getchar(), it takes that newline character from the stream, as it's the first thing sitting there.

The getline() function takes the newline character as well.

You can either use getline(), clear the stream after the first input, or use two calls to getchar() (or one of the other character retrieval methods).
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pietra
RE: Cin
15 Mar, 2007 - 09:33 AM
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I knew you're gonna answer Amadeus and help me, thank you smile.gif

If I continue like this and you keep helping me out I'll have to take you to lunch some day cool.gif
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Amadeus
RE: Cin
15 Mar, 2007 - 09:36 AM
Post #4

g++ -o drink whiskey.cpp
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Hahahaha...no worries! smile.gif
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