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stay C++ Can be used in

getline(cin,s1);

To input a string , frequently-used cin Input mode You cannot enter a string containing embedded spaces

cin Display by entering English name

Code display ：
 

#include<bits/stdc++.h> 
#include<string>

using namespace std;

int main( )
{
	string name, age, sex;
//	getline(cin, name);
//	getline(cin, age);
//	getline(cin, sex);
	
	cin >> name;
	cin >> age;
	cin >> sex; 
	cout << name << endl;
	cout << age << endl;
	cout << sex << endl; 
    return 0;
}

Output results ：

simth elvin
10
simth
elvin
10

--------------------------------
Process exited after 16.51 seconds with return value 0
 Please press any key to continue . . .

but getline  Of  C++  Function can read the whole line , Including leading and embedded spaces , And store it in a string object .
getline Method input English name

Code display ：

#include<bits/stdc++.h> 
#include<string>

using namespace std;

int main( )
{
	string name, age, sex;
	getline(cin, name);
	getline(cin, age);
	getline(cin, sex);
	
//	cin >> name;
//	cin >> age;
//	cin >> sex; 
	cout << name << endl;
	cout << age << endl;
	cout << sex << endl; 
    return 0;
}

Output results ;

Simth elvin
10
man
Simth elvin
10
man

--------------------------------
Process exited after 28.29 seconds with return value 0
 Please press any key to continue . . .