taking input of a string word by word

Question

I just started learning C    I was just playing around with it and came across a problem which involved taking input of a string word by word  each word separated by a whitespace  What I mean is  suppose I have     name  place animal    as the input  I want to read the first word  do some operations on it  Then read the second word  do some operations on that  and then read the next word  so on    I tried storing the entire string at first with getline  like this        include lt iostream gt      using namespace std      int main              string t       getline cin t        cout  lt  lt  t    just to confirm the input is read correctly         But then how do I perform operation on each word and move on to the next word   Also  while googling around about C   I saw at many places  instead of using  using namespace std  people prefer to write  std    with everything  Why s that  I think they do the same thing  Then why take the trouble of writing it again and again

User · Accepted Answer

Put the line in a stringstream and extract word by word back:

#include <iostream>
#include <sstream>
using namespace std;

int main()
{
    string t;
    getline(cin,t);

    istringstream iss(t);
    string word;
    while(iss >> word) {
        /* do stuff with word */
    }
}

Of course, you can just skip the getline part and read word by word from cin directly.

And here you can read why is using namespace std considered bad practice.

User · Answer

This is for the benefit of others who may refer   You can simply use cin and a char array  The cin input is delimited by the first whitespace it encounters    include lt iostream gt  using namespace std   main         char word 50       cin gt  gt word      while word             Do stuff with word           cin gt  gt word

User · Answer

getline is storing the entire line at once  which is not what you want  A simple fix is to have three variables and use cin to get them all  C   will parse automatically at the spaces    include  lt iostream gt  using namespace std   int main         string a  b  c      cin  gt  gt  a  gt  gt  b  gt  gt  c        now you have your three words     return 0      I don t know what particular  operation  you re talking about  so I can t help you there  but if it s changing characters  read up on string and indices  The C   documentation is great  As for using namespace std  versus std   and other libraries  there s already been a lot said  Try these questions on StackOverflow to start

[c++] taking input of a string word by word

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