#include <iostream>
#include <vector>
#include <functional>

class ChainStack
{
private:
	std::vector<std::function<void(ChainStack* chain)>> _chainStack;
	int _currentIndex = 0;
	std::function<void()> _funcComplete;
	std::function<void()> _funcCancel;
	bool _isCanceled = false;

public:
	void addFunc(std::function<void(ChainStack*)> func) { _chainStack.push_back(func); }
	void doNext() {
		if (_isCanceled) return;
		if (_currentIndex >= _chainStack.size()) {
			// 全て終了
			if (_funcComplete) {
				_funcComplete();
			}
			return;
		}
		auto func = _chainStack.at(_currentIndex);
		_currentIndex ++;
		func(this);
	}
	void cancel() {
		_isCanceled = true;
		if (_funcCancel) {
			_funcCancel();
		}
	}

	void start(std::function<void()> complete=nullptr, std::function<void()> cancel=nullptr) {
		_currentIndex = 0;
		_funcComplete = complete;
		_funcCancel = cancel;
		_isCanceled = false;
		doNext();
	}
};

int main() 
{
	// 乱数値のシード設定
	time_t t = time(NULL);
	srand(t);

	//
	// ChainStackの実装例
	//
	auto chain = new ChainStack();
	chain->addFunc([](ChainStack *chain) {
		std::cout << "演出１\n";
		chain->doNext();
	});

	chain->addFunc([](ChainStack *chain) {
		std::cout << "<1/2の確率で大当たり判定>\n";
		int val = rand() % 100;
		std::cout << val << "\n";
		if (val < 50) {
			std::cout << "残念...\n";
			chain->cancel();
		}
		else {
			std::cout << "大当たり！\n";
			chain->doNext();
		}
	});

	chain->addFunc([](ChainStack *chain) {
		std::cout << "追加の大当たり演出\n";
		chain->doNext();
	});


	chain->start([chain]() {
		std::cout << "全ての演出完了\n";
		delete chain;
	},
	[chain]() {
		std::cout << "途中キャンセル\n";
		delete chain;
	});

	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
}