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Why we use string library while using string data type?

ZahoorKhan (94)
According to book from which I am learning C++, you should add string library before using string data type, but suddenly when I missed adding string library the program was still working fine why?
( https://i.imgsafe.org/2bb7b68.png )

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#include <iostream>
#include <string>
using namespace std;
int main()
{
 string day = "Monday";
 
 cout << day << " Go to school\n";
 
 return 0;
}


and also working without string library:-

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#include <iostream>
using namespace std;
int main()
{
 string day = "Monday";
 
 cout << day << " Go to school\n";
 
 return 0;
}


So, why we write a additional line if program is working fine without it, or it is doing something else that I am missing to know?
Last edited on
TarikNeaj (2580)
http://www.cplusplus.com/forum/general/4202/

Edit: Might I add that both my and @cire's link can be found with a simple google search.
Last edited on
cire (8284)
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