c++中字符输入函数cin.getline在输入char与string时的不同

cin.getline在输入char时：

using namespace std;

    const int ArSize = ;

    char name[ArSize];

    char dessert[ArSize];

    cout << "Enter your name:\n";

    cin.getline(name, ArSize);  // reads through newline

    cout << "Enter your favorite dessert:\n";

    cin.getline(dessert, ArSize);

getline在输入string时：

#include<iostream>

#include<string>

using namespace std;

int main()

{

    string name;

    string dessert;

    cout<<"Enter your name:\n";

    getline(cin,name);

    cout<<"Enter your favorite dessert:\n";

    getline(cin,dessert);