Basic input output in C++

Basic input output in C++

C++ comes with a libraries which is help us in programming input/output. In C++ sequence of bytes corresponding to input and output are commonly known as stream.

1. Input Stream:-

    Direction of flow of bytes take place from input devices. 

    For example: keyboard to the main memory.

2. Output Stream:-

    Direction of flow of bytes take place from main memory to the output device. 

    For example: Display.

Lets take one example 

# include<iostream>

using namespace std;

int main();

{

 int num1, num2;

 cout<<"Enter the value of num1 and num2 <<endl;   -- Output function

 cin>>num1>>num2>>endl;                          -- Input function

 cout<<"The sum of mum1 and num2 is = "<<num1+num2<<endl;

return 0;

}

Reserved keyword in C++

• This is a list of keyword reserved in C++
• Since they are uses by the language itself these keywords are not available for variable and overloading.
• In short you can not create a variable with these names 

There are some reserved keyword in C++ following are:-

• alignas (since C++11)
• alignof (since C++11)
• and
• and_eq
• asm
• atomic_cancel (TM TS)
• atomic_commit (TM TS)
• atomic_noexcept (TM TS)
• auto (1)
• bitand
• bitor
• bool
• break
• case
• catch
• char
• char8_t (since C++20)
• char16_t (since C++11)
• char32_t (since C++11)
• class (1)
• compl
• concept (since C++20)
• const
• consteval (since C++20)
• constexpr (since C++11)
• constinit (since C++20)
• const_cast
• continue
• co_await (since C++20)
• co_return (since C++20)
• co_yield (since C++20)
• decltype (since C++11)
• default (1)
• delete (1)
• do
• double
• dynamic_cast
• else
• enum
• explicit
• export (1) (3)
• extern (1)
• false
• float
• for
• friend
• goto
• if
• inline (1)
• int
• long
• mutable (1)
• namespace
• new
• noexcept (since C++11)
• not
• not_eq
• nullptr (since C++11)
• operator
• or
• or_eq
• private
• protected
• public
• reflexpr (reflection TS)
• register (2)
• reinterpret_cast
• requires (since C++20)
• return
• short
• signed
• sizeof (1)
• static
• static_assert (since C++11)
• static_cast
• struct (1)
• switch
• synchronized (TM TS)
• template
• this
• thread_local (since C++11)
• throw
• true
• try
• typedef
• typeid
• typename
• union
• unsigned
• using (1)
• virtual
• void
• volatile
• wchar_t
• while
• xor

--------------------------------------------------

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