#include <iostream>
#include <vector>
#include <string>
#include <fstream>
#include <sstream>
#include <unordered_map>
#include <algorithm>

std::string clean_text(const std::string& text) {
    std::string cleaned_text = text;
    cleaned_text.erase(std::remove_if(cleaned_text.begin(), cleaned_text.end(), 
        [](unsigned char c){ return std::ispunct(c) || std::isdigit(c); }), cleaned_text.end());
    std::transform(cleaned_text.begin(), cleaned_text.end(), cleaned_text.begin(), std::tolower);
    return cleaned_text;
}

void read_training_data(const std::string& filename, std::vector<std::pair<std::string, std::string>>& data) {
    std::ifstream input_file(filename);
    if (!input_file.is_open()) {
        std::cerr << "Cannot open file: " << filename << std::endl;
        return;
    }
    std::string line;
    while (std::getline(input_file, line)) {
        std::stringstream line_stream(line);
        std::string label, text;
        std::getline(line_stream, label, ',');
        std::getline(line_stream, text);
        text = clean_text(text);
        data.emplace_back(label, text);
    }
    input_file.close();
}
std::string classify_text(const std::string& text, const std::unordered_map<std::string, double>& class_priors, 
    const std::unordered_map<std::string, std::unordered_map<std::string, double>>& class_cond_probs) {
    std::string cleaned_text = clean_text(text);
    std::vector<std::string> words;
    std::stringstream text_stream(cleaned_text);
    std::string word;
    while (text_stream >> word) {
        words.push_back(word);
    }
    std::unordered_map<std::string, double> class_scores;
    for (const auto& class_prior : class_priors) {
        double score = class_prior.second;
        for (const auto& word : words) {
            if (class_cond_probs[class_prior.first].count(word) > 0) {
                score *= class_cond_probs.at(class_prior.first).at(word);
            }
        }
        class_scores[class_prior.first] = score;
    }
    auto max_class = std::max_element(class_scores.begin(), class_scores.end(), [](const auto& a, const auto& b) {
        return a.second < b.second;
    });
    return max_class->first;
}

int main() {
    // membaca data latih dari file
    std::vector<std::pair<std::string, std::string>> training_data;
    read_training_data("training_data.csv",

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
}