#include<iostream>
using namespace std;
 int st,ins;
class dfa
{
	public:
	bool final;
	int *p;
	dfa()
	{
		this->final=false;
		p=new int[ins];
	}
	static void getTransistionTable();
	static void stringChecking(string);
					
};
dfa *states;
void dfa::getTransistionTable(){
	for(int i=0;i<st;i++)	 
	  for(int j=0;j<ins;j++)
	   {
	     cout<<"Enter the transistion for state "<<i<<" input symbol "<<(char)(97+j)<<" :  ";
	     cin>>states[i].p[j];
	   }
	cout<<"Enter the Accepted state: ";
	int f;
	cin>>f;
	states[f-1].final=true;
}
void dfa::stringChecking(string str){
dfa temp=states[0];
	for(int i=0;i<str.length();i++)
	{
		int n=temp.p[(int)str[i]-97];
		temp=states[n-1];		
	}
	if(temp.final)
	cout<<"The given input string is accepted by this DFA";
	else
	cout<<"The given input string is not accepted by this DFA";
}
int main()
{
   cout<<"Enter the no of States : ";
   cin>>st;
   cout<<"Enter the no of input symbols : ";
   cin>>ins;
   states =new dfa[st];
   dfa::getTransistionTable();
   cout<<"Enter the input string: ";
   string input;
   cin>>input;
   dfa::stringChecking(input);
	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
}