#include<iostream>
#include<conio.h>
#include<fstream>
using namespace std;

int main()
{
 ofstream fwrite("Alphabets.txt");  fwrite<<"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 fwrite.close();

 ifstream fread("Alphabets.txt");  ofstream fwrite1("Vowels.txt");
 ofstream fwrite2("Consonants.txt");

 char c;

while(fread)
{
  fread.get(c);
  if(c=='A' || c=='E' || c=='I' || c=='O' || c=='U')
 	fwrite1<<c;
  else
 	fwrite2<<c;
 }

 fread.close();  fwrite1.close();  fwrite2.close();

 fread.open("Alphabets.txt");  ifstream fread1("Vowels.txt");
 ifstream fread2("Consonants.txt");

 cout<<"\n\nContents of Alphabets File\n";  cout<<"--------------------------\n";
 while(fread)
 {
  fread.get(c);
  cout<<c;
 }

 fread.close();

 cout<<"\n\nContents of Vowels File\n";  cout<<"-----------------------\n";
 while(fread1)
 {
  fread1.get(c);
  cout<<c;
 }

 fread1.close();
  cout<<"\n\nContents of Consonants File\n";  cout<<"---------------------------\n";
 while(fread2)
 {
  fread2.get(c);
  cout<<c;
 }

 fread2.close();
 getch();
 return 0;
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

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
}