#include <bits/stdc++.h>
using namespace std;

//  we will create this function to print the values of the vector

void printvec( vector<int> &v){
  cout << "size: " << v.size() << endl;
  
  for( int i=0; i<v.size(); i++){
    
    cout << v[i] << " ";
  }
  
  cout << endl;
}

//  function for printing the string

void printvec( vector<string> &v){
  cout << "size: " << v.size() << endl;
  
  for( int i=0; i<v.size(); i++){
    
    cout << v[i] << " ";
  }
  cout << endl;
}

int main() 
{
    
   /* 
   
   vector<int> v;
    int n;
    cin>>n;
    
    for( int i=0; i<n; i++){
      
      int x;
      cin>>x;
      
      printvec(v);
      v.push_back(x); 
    }
    
    // we will call print function to print the values of the vector
    printvec(v);
    
  */
  
  /* first argument will tell the size
  
  second argument will tell the element
  
  vector<int> v(5);
  printvec(v);  //    THIS WILL PRINT 0 FIVE TIMES
  
   vector<int> v(10,3) ;  
   printvec(v);     //  THIS WILL PRINT 3 (10 TIMES)
 
   */
 
/* 
vector<int>v;
 
  v.push_back(7);
  printvec(v) ;
  
  v.pop_back();  //    POP FUNCTION REMOVES THE LAST ELEMENT FROM THE VECTOR AND REUCES THE SIZE BY 1
  printvec(v);

*/

/*

vector<int> v;
v.push_back(7);
v.push_back(6);

// vector<int> v2 = v;   // O(N)  more expensive operation

vector<int> &v2 = v; // less expensive operation 
v2.push_back(5);
printvec(v);
printvec(v);
printvec(v2);
  
*/

vector<string> v;
int n;
cin>>n;

for(int i=0; i<n; i++){
  string s;
  cin>>s;
  
  v.push_back(s);
}

printvec(v);

    return 0;
}
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Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}