How to input text into array of strings?

Question

string fruits[200];

How can I input a string into the array ?

Example:
My mom has apples;
So , fruits array will contain:
fruits[0] = "My";
fruits[1] = "mom";
..........etc.

How can I do that?

Where is the input coming from? User input or from a pre-defined string? — Aamir
– Aamir, Commented Nov 19, 2012 at 14:37
Saying "it doesn't work" isn't helpful. You have to show us exactly what you tried, tell us what you expected to happen, and what happened. — David Schwartz
– David Schwartz, Commented Nov 19, 2012 at 14:39

Xiao Jia · Accepted Answer · 2012-11-19 14:37:45Z

6

If you're reading from the standard input:

int i = 0;
for (string word; cin >> word; i++)
    names[i] = word;

If you're reading from a string, use istringstream instead.

answered Nov 19, 2012 at 14:37

Xiao Jia

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7 Comments

Johnnie Over a year ago

okay but this will infinite loop , how can I stop this and continue to the other instructions ?

Xiao Jia Over a year ago

@Johnnie cin >> word will return false when there's no more word to read. Try it :-)

Johnnie Over a year ago

I've tried if(word == null) break; else names[i] = word; but I get no match for operator == in word==0; what's wrong?

WhozCraig Over a year ago

Fwiw, unless you have a specific reason to examine the intermediate word prior to insertion, this can be reduced further to simply int i=0; while (cin >> names[i]) ++i;

WhozCraig Over a year ago

@XiaoJia I believe while (cin >> names[i++]) may be incorrect, as I believe even in failure the post-increment is applied, in which case your resulting count will always be off by one. Someone check me on that.

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Sergey Kalinichenko · Accepted Answer · 2012-11-19 14:42:36Z

3

If you would like to use the standard C++ library to its fullest, use input iterators and a vector<string> instead of an array:

vector<string> words;
back_insert_iterator< vector<string> > back_iter (words);
istream_iterator<string> eos;
istream_iterator<string> iit (cin);
copy (iit, eos, back_iter);

Using vector<string> fixes the problem of having to guess how many words would be entered, and living with the consequences of making a wrong guess.

answered Nov 19, 2012 at 14:42

Sergey Kalinichenko

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Comments

utnapistim · Accepted Answer · 2012-11-19 15:59:38Z

0

The most compact solution:

vector<string> words; 
copy(istream_iterator<string>(cin), 
     istream_iterator<string>(), 
     back_inserter(words));

This is @dasblinkenlight's solution, written using temporary variables.

answered Nov 19, 2012 at 15:59

utnapistim

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