Hi
how can I get multiple words in a string ?
When I use cin >> string;it just stores first word!
I also use getline();, but it didn't work correctly!

Hello,

You can use cin.getline. The important thing for using it is you have to pay attention to cursor position.

Say you want to read an integer and then read a whole line:

5
aaaa bbbb cccc
dddd eeee

Imagin we have a cursor here that we show it by ^ character.

^5
aaaa bbbb cccc
dddd eeee

When you read the first integer using int a; cin >> a, it reads the integer and moves the cursor.

5^
aaaa bbbb cccc
dddd eeee

No, after doing a string str; getline(cin, str) the function reads everything after the cursor till it reachs \n. In this case it reads nothing, and moves the cursor to after \n.

5
^aaaa bbbb cccc
dddd eeee

Now, if you do a getline(cin, str), it'll read the whole line and moves the cursur to the beggining of the next line.

5
aaaa bbbb cccc
^dddd eeee

TL; DR

You should read an integer and all the following line, this way:

int a; string str;
cin >> a;
getline(cin, str); // reads nothing, but moves the cursor,
                   // or you can use anything that reads only one character to move the cursor
while (getline(cin, str)) {
    // str contains the whole line
}

if you have a cin before getline() you shoude write getchar() after cin

the library of getchar() is stdio.h

you should write like this: cin >> n; getchar(); getline(cin,str);

Thank you guys for giving your precious time ;-)

Thank you guys for taking your precious time ;-)