#include<iostream> 
using namespace std; 
int main() 
{ 

	int arr[4][2] = { {0,0}, 
		{0,1}, 
		{1,0}, 
		{1,1} 
	}; 

	int t[4] = {0,1,1,1}; 
	float alp = 0.1; 


	float w1 = 0.0, w2 = 0.0, b = 0.0, yi; 
	float dw1,dw2,db;
	int  i, j, yo;

for (i = 0; i < 1; i++)
	{ 
    cout << "EPOCH: " << i + 1 << endl;
		for(j = 0; i < 4; i++) 
		{ 
		  cout<<"Input "<<i+1<<" : "<<endl;
			yi = arr[j][0] * w1 + arr[j][1] * w2; 		
			cout<<"yi = "<<arr[j][0]<<"*"<<w1<<" + "<<arr[j][1]
			<<"*"<<w2<<endl;
			cout<<"yi = "<<yi<<endl;
			
		//threshold
			if(yi >= 0.2) 
			{ 
				yo = 1; 
			} 
			else
			{ 
				yo = 0; 
			} 
			if(t[i] == yo) 
			{ 
				dw1 = 0; 
				cout<<"dw1 = "<<dw1<<endl;
				dw2 = 0; 
				cout<<"dw2 = "<<dw1<<endl;
				db = 0; 
				cout<<"db = "<<dw1<<endl;
			} 

			else
			{ 
				dw1 = alp*(t[i] - yo) * arr[i][0]; 
				cout<<"dw1 = "<<dw1<<endl;
				dw2 = alp*(t[i] - yo) * arr[i][1]; 
				cout<<"dw2 = "<<dw1<<endl;
				//db = alp*(t[i] - yo); 
				//cout<<"db = "<<dw1<<endl;
			} 
			cout<<"w1="<<w1<<"+"<<dw1<<endl;
			w1 = w1 + dw1;
			cout<<"w1 ="<<dw1<<endl;
			cout<<"w2="<<w2<<"+"<<dw2<<endl;
			w2 = w2 + dw2; 
			cout<<"w2 ="<<dw2<<endl;
			//cout<<"b="<<b<<"+"<<db<<endl;
		//	b = b + db; 
		//	cout<<"b ="<<b<<endl<<endl;

		} 

	} 
}

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
}