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


// helper: print element with index IDX of tuple with MAX elements
template <int IDX, int MAX, typename... Args>
struct PRINT_TUPLE {
static void print (std::ostream& strm, const std::tuple<Args...>& t) {
strm << std::get<IDX>(t) << (IDX+1==MAX ? "" : ",");
PRINT_TUPLE<IDX+1,MAX,Args...>::print(strm,t);
}
};
// partial specialization to end the recursion
template <int MAX, typename... Args>
struct PRINT_TUPLE<MAX,MAX,Args...> {
static void print (std::ostream& strm, const std::tuple<Args...>& t) {
}
};
// output operator for tuples
template <typename... Args>
std::ostream& operator << (std::ostream& strm,
const std::tuple<Args...>& t)
{
strm << "[";
PRINT_TUPLE<0,sizeof...(Args),Args...>::print(strm,t);
return strm << "]";
}

int main()
{

tuple <int,float,string,int,string> mytuple(77,1.1,"more light",23,"prism");
cout << "io: " << mytuple << endl;
}
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C++ Online Compiler

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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
}