Answer 1

gets comes from the stdio.h header file which is from the c i/o system
getline is a function in string header file that essentially does what cin >> string does.

BIG DIFFERENCE: getline is for working with strings, gets uses a char * for its work

#include <stdio.h>
#include <string>
#include <iostream>

int main ()
{
char mySentence [100];
gets (mySentence);
std::string myNewSentence;
std::getline (std::cin, myNewSentence);

return 0;
}