cpp input getline() function usage

1. getline()

#include<iostream>
getline(cin,temp,delim);

• cin is the standard input stream function
• temp is the variable name used to store characters
• delim is the end sign

example

Input: 10.70.44.68, split the number

string ip;
cin>>ip;
istringstream iss(ip);
string seg;
vector<int> v;
while(getline(iss,seg,'.')) v.push_back(stoi(seg));

string seg;
vector<int> v;
while(getline(cin,seg,'.')) v.push_back(stoi(seg));

二、cin.getline()

#include<iostream>
getline（char * s，n）;
getline（char * s，n，delim）;

• s is a character array, such as char name[100]
• n is the number of characters to be read
• delim is the end mark, default is newline character

example

#include <iostream> 
using namespace std;

int main () {
    
    
  char name[256]
 
  cout << "Please, enter your name: ";
  cin.getline (name,256);
  cout << name << endl;
 
  return 0;
}

Three, the difference

• getline() is a function of string stream and can only be used for string type input operations. When you define a string type variable, you can only use getline() to input it.
• cin.getline is a function of std stream, used for char type input operations. When you define a char type variable, it can only be input using cin/cin.getline().