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AXER-docvs.Roua99

double value

Metaprogramming
  • added compile-time template
  • added random test for runtime function
  • replaced x * 2 with x << 1
Code
Diff
  • constexpr int doubleValue(int x) {
    return x << 1;
}

template<int x> struct Double {
  static constexpr int value = (x << 1);
};
    • #include<iostream>
    • int doubleValue(int x) {
    • return x * 2;
    • constexpr int doubleValue(int x) {
    • return x << 1;
    • }
    • template<int x> struct Double {
    • static constexpr int value = (x << 1);
    • };
AXER-docvs.almahfuz

almahfuz's Kumite #2

Trying to guess what the author meant

Code
Diff
  • function rgbToHsv(rgb) {
  let r = rgb[0], g = rgb[1], b = rgb[2];
  const v = Math.max(r, g, b) / 255;
  if (v == 0) return Array.of(0, 0, 0);
  r /= v;
  g /= v;
  b /= v;
  const s = 1 - Math.min(r, g, b) / 255;
  if (s == 0) return Array.of(0, 0, v * 100);
  r = 255 - (255 - r) / s;
  g = 255 - (255 - g) / s;
  b = 255 - (255 - b) / s;
  const peak = Math.max(r, g, b);
  let h = 0;
  if (r == peak) h = g < b ? 360 - b * 60 / 255 : g * 60 / 255;
  else if (g == peak) h = r > b ? 120 - r * 60 / 255 : 120 + b * 60 / 255;
  else h = r > g ? 240 + r * 60 / 255 : 240 - g * 60 / 255;
  return Array.of(Math.round(h), Math.round(s * 100), Math.round(v * 100));
}
    • describe("Solution", function() {
    • it("should test for something", function() {
    • });
    • });
    • function rgbToHsv(rgb) {
    • let r = rgb[0], g = rgb[1], b = rgb[2];
    • const v = Math.max(r, g, b) / 255;
    • if (v == 0) return Array.of(0, 0, 0);
    • r /= v;
    • g /= v;
    • b /= v;
    • const s = 1 - Math.min(r, g, b) / 255;
    • if (s == 0) return Array.of(0, 0, v * 100);
    • r = 255 - (255 - r) / s;
    • g = 255 - (255 - g) / s;
    • b = 255 - (255 - b) / s;
    • const peak = Math.max(r, g, b);
    • let h = 0;
    • if (r == peak) h = g < b ? 360 - b * 60 / 255 : g * 60 / 255;
    • else if (g == peak) h = r > b ? 120 - r * 60 / 255 : 120 + b * 60 / 255;
    • else h = r > g ? 240 + r * 60 / 255 : 240 - g * 60 / 255;
    • return Array.of(Math.round(h), Math.round(s * 100), Math.round(v * 100));
    • }
AXER-docvs.GECCode

and, or, xor, nand, nor without "&&", "||", "^", "&", "|"

Even shorter

Code
Diff
  • bool Or(bool a, bool b) {return a+b;}
bool And(bool a, bool b) {return a*b;}
bool Xor(bool a, bool b) {return a!=b;}
bool Nor(bool a, bool b) {return !a*!b;}
bool Nand(bool a, bool b) {return 1-a*b;}
    • bool Or(bool a, bool b) {
    • return a+b;
    • }
    • bool And(bool a, bool b) {
    • return a*b;
    • }
    • bool Xor(bool a, bool b) {
    • return a!=b;
    • }
    • bool Nor(bool a, bool b) {
    • return !(a+b);
    • }
    • bool Nand(bool a, bool b) {
    • return !(a*b);
    • }
    • bool Or(bool a, bool b) {return a+b;}
    • bool And(bool a, bool b) {return a*b;}
    • bool Xor(bool a, bool b) {return a!=b;}
    • bool Nor(bool a, bool b) {return !a*!b;}
    • bool Nand(bool a, bool b) {return 1-a*b;}
AXER-docvs.Yalalovaalina

Yalalovaalina's Kumite #2

Some creative code

Code
Diff
  • #include <iostream>
using namespace std;     
int _main() {
  setlocale (LC_ALL, "RUS");
  int a=1, b=2, c=3, d=4, e=5;
  int result_int_1=(a+b+c+d+e)/5;
  int result_int_2=(1+2+3+4+5)/5;
  int result_int_3=15/5;
  int result_int_4=3;
  bool equal_1_2 = result_int_1 == result_int_2;
  bool equal_2_3 = result_int_1 == result_int_2;
  bool equal_3_4 = result_int_1 == result_int_2;
  cout << equal_1_2 << ' ' << equal_2_3 << ' ' << equal_3_4 << endl;
  if (equal_1_2 && equal_2_3 && equal_3_4) cout << "All results are same." << endl;
  return 0;
}
    • #include <instream>
    • #include <iostream>
    • using namespace std;
    • int main()}
    • setlocale (LC ALL, "RUS")
    • int a=1 b=2 c=3 d=4 e=5
    • int result_int=(a+b+c+d+e)/5
    • int result_int=(1+2+3+4+5)/5
    • int result_int=15/5
    • int resulr_int=
    • int _main() {
    • setlocale (LC_ALL, "RUS");
    • int a=1, b=2, c=3, d=4, e=5;
    • int result_int_1=(a+b+c+d+e)/5;
    • int result_int_2=(1+2+3+4+5)/5;
    • int result_int_3=15/5;
    • int result_int_4=3;
    • bool equal_1_2 = result_int_1 == result_int_2;
    • bool equal_2_3 = result_int_1 == result_int_2;
    • bool equal_3_4 = result_int_1 == result_int_2;
    • cout << equal_1_2 << ' ' << equal_2_3 << ' ' << equal_3_4 << endl;
    • if (equal_1_2 && equal_2_3 && equal_3_4) cout << "All results are same." << endl;
    • return 0;
    • }
AXER-docvs.KxAy-bot

C++ Simple Calculator

  • fixed return in Calculator()
  • division by zero in faiDivisione() now causes exception which is caught in Calculator()
  • grouped tests into Valid_Input_Test and Invalid_Input_Test
Code
Diff
  • #include <iostream>
using namespace std;

int faiAddizione(int x, int y);
int faiSottrazione(int x, int y);
int faiMoltiplicazione(int x, int y);
int faiDivisione(int x, int y);
int faiModulus(int x, int y);  


string die() {
  return "Invalid Input!";
}

string Calculator(int choice, int x, int y) {
  cout << "Welcome to simple calculator!\n";
  cout << "1. Addition\n2. Subtraction\n3. Multiplication\n4. Division\n5. Modulus\n";
  string res;
  try {
    switch (choice) {
        case 1 : res = to_string(faiAddizione(x, y)); break;
        case 2 : res = to_string(faiSottrazione(x, y)); break;
        case 3 : res = to_string(faiMoltiplicazione(x, y)); break;
        case 4 : res = to_string(faiDivisione(x, y)); break;
        case 5 : res = to_string(faiModulus(x, y)); break;
        default : res = die();
    }
  } catch (const exception &e) {
    res = die();
  }
  cout << res << endl;
  return res;
}  

int faiAddizione(int x, int y) {
  return x + y;
}

int faiSottrazione(int x, int y) {
  return x - y;
}

int faiDivisione(int x, int y) {
  if (y == 0) throw invalid_argument("Division by zero");
  return x / y;
}

int faiMoltiplicazione(int x, int y) {
  return x * y; 
}

int faiModulus(int x, int y) {
  return x % y;
}
    • #include <iostream>
    • using namespace std;
    • int faiAddizione(int x, int y);
    • int faiSottrazione(int x, int y);
    • int faiMoltiplicazione(int x, int y);
    • int faiDivisione(int x, int y);
    • int faiModulus(int x, int y);
    • string die() {
    • return "Invalid Input!";
    • }
    • string Calculator(int choice, int x, int y) {
    • cout << "Welcome to simple calculator!
    • ";
    • cout << "1. Addition
    • 2. Subtraction
    • 3. Multiplication
    • 4. Division
    • 5. Modulus
    • ";
    • // YOU: Write code to finish this program (Input is given, don't use cin)
    • switch(choice){
    • case 1 : cout << faiAddizione(x, y);
    • break;
    • case 2 : cout << faiSottrazione(x, y);
    • break;
    • case 3 : cout << faiMoltiplicazione(x, y);
    • break;
    • case 4 : cout << faiDivisione(x, y);
    • break;
    • case 5 : cout << faiModulus(x,y);
    • break;
    • default : return die();
    • break;
    • cout << "Welcome to simple calculator!
    • ";
    • cout << "1. Addition
    • 2. Subtraction
    • 3. Multiplication
    • 4. Division
    • 5. Modulus
    • ";
    • string res;
    • try {
    • switch (choice) {
    • case 1 : res = to_string(faiAddizione(x, y)); break;
    • case 2 : res = to_string(faiSottrazione(x, y)); break;
    • case 3 : res = to_string(faiMoltiplicazione(x, y)); break;
    • case 4 : res = to_string(faiDivisione(x, y)); break;
    • case 5 : res = to_string(faiModulus(x, y)); break;
    • default : res = die();
    • }
    • } catch (const exception &e) {
    • res = die();
    • }
    • cout << res << endl;
    • return res;
    • }
    • int faiAddizione(int x, int y)
    • { return (x + y);
    • int faiAddizione(int x, int y) {
    • return x + y;
    • }
    • int faiSottrazione(int x, int y){
    • return (x - y);
    • int faiSottrazione(int x, int y) {
    • return x - y;
    • }
    • int faiDivisione(int x, int y){
    • if(y != 0){
    • return (x/y);
    • }
    • else
    • {
    • die();
    • return 0;
    • }
    • int faiDivisione(int x, int y) {
    • if (y == 0) throw invalid_argument("Division by zero");
    • return x / y;
    • }
    • int faiMoltiplicazione(int x, int y){
    • return (x * y);
    • int faiMoltiplicazione(int x, int y) {
    • return x * y;
    • }
    • int faiModulus(int x, int y){
    • return (x % y);
    • int faiModulus(int x, int y) {
    • return x % y;
    • }
AXER-docvs.Feliks-WR

Write your own sum()

  • removed returning -1 for an empty array
  • removed std::accumulate since it truncates all doubles to integers
  • fixed tests
Code
Diff
  • #include <vector>

template <typename T = double>
decltype(T() + T()) sum(const std::vector<T>& v) {
  decltype(T() + T()) res = 0;
  for (const T &num : v) res += num;
  return res;
}
    • #include <vector>
    • #include <numeric>
    • #include <vector>
    • template <typename T = double>
    • int sum(const std::vector<T>& v) {
    • return v.size() == 0 ? -1
    • : std::accumulate(v.begin(), v.end(), 0);
    • decltype(T() + T()) sum(const std::vector<T>& v) {
    • decltype(T() + T()) res = 0;
    • for (const T &num : v) res += num;
    • return res;
    • }
AXER-docvs.oantby

String Split

KISS — Keep It Short and Simple

Code
Diff
  • #include <string>
#include <vector>

using std::string;
using std::vector;

vector<string> split(const string& str, char sep, bool strip = true) {
  vector<string> result;
  string buf;
  for (char c : str) {
    if (c == sep) {
      if (!strip || !buf.empty()) {
        result.push_back(buf);
        buf.clear();
      }
    } else buf.push_back(c);
  }
  if (!strip || !buf.empty()) result.push_back(buf);
  return result;
}
    • #include <string>
    • #include <vector>
    • auto split(const std::string& str, char sep) {
    • auto result = std::vector<std::string>{};
    • std::string::size_type pos = 0, pos2 = 0;
    • while ((pos2 = str.find(sep, pos)) != std::string::npos) {
    • result.push_back(str.substr(pos, pos2 - pos));
    • pos = pos2 + 1;
    • using std::string;
    • using std::vector;
    • vector<string> split(const string& str, char sep, bool strip = true) {
    • vector<string> result;
    • string buf;
    • for (char c : str) {
    • if (c == sep) {
    • if (!strip || !buf.empty()) {
    • result.push_back(buf);
    • buf.clear();
    • }
    • } else buf.push_back(c);
    • }
    • result.push_back(str.substr(pos));
    • if (!strip || !buf.empty()) result.push_back(buf);
    • return result;
    • }
AXER-docvs.oantby

C++ functions that return the mean of an integer array

Next challenge is to mean long long array

Code
Diff
  • class Mean {
public:
  static double meanAsDouble(const int x[], int n) {
    long long s = 0;
    for (int i = 0; i < n; ++i) s += x[i];
    return s / n + static_cast<double>(s % n) / n;
  }
  static int meanRounded(const int x[], int n) {
    long long s = 0;
    for (int i = 0; i < n; ++i) s += x[i];
    int part = s / n;
    int rem = s % n;
    int cm = n - rem;
    return part + (rem > cm || (rem == cm && part % 2));
  }
  static int meanTruncated(const int x[], int n) {
    long long s = 0;
    for (int i = 0; i < n; ++i) s += x[i];
    return s / n;
  }
};
    • #include <numeric>
    • double Mean(double x[], int n){
    • return std::accumulate(x, x + n, 0) / n;
    • }
    • class Mean {
    • public:
    • static double meanAsDouble(const int x[], int n) {
    • long long s = 0;
    • for (int i = 0; i < n; ++i) s += x[i];
    • return s / n + static_cast<double>(s % n) / n;
    • }
    • static int meanRounded(const int x[], int n) {
    • long long s = 0;
    • for (int i = 0; i < n; ++i) s += x[i];
    • int part = s / n;
    • int rem = s % n;
    • int cm = n - rem;
    • return part + (rem > cm || (rem == cm && part % 2));
    • }
    • static int meanTruncated(const int x[], int n) {
    • long long s = 0;
    • for (int i = 0; i < n; ++i) s += x[i];
    • return s / n;
    • }
    • };
AXER-docvs.HRUMHRUMHRUM

Produce the 1st N Fibonnaci Numbers

// FIXME

Code
Diff
  • using std::string;
using std::vector;

string sumPositive(const string &x, const string &y) {
  size_t m = x.size(), n = y.size();
  string res;
  short acc = 0;
  for (size_t i = 1; i <= m && i <= n; ++i) {
    acc += x[m-i] - '0';
    acc += y[n-i] - '0';
    res.push_back(acc % 10 + '0');
    acc /= 10;
  }
  for (size_t i = n + 1; i <= m; ++i) {
    acc += x[m-i] - '0';
    res.push_back(acc % 10 + '0');
    acc /= 10;
  }
  for (size_t i = m + 1; i <= n; ++i) {
    acc += y[n-i] - '0';
    res.push_back(acc % 10 + '0');
    acc /= 10;
  }
  if (acc > 0) res.push_back(acc + '0');
  size_t s = res.size();
  for (size_t i = 0; i < s / 2; ++i) {
    char c = res[i];
    res[i] = res[s-i-1];
    res[s-i-1] = c;
  }
  return res;
}

vector<string> getFibs(size_t n) {
  if (n == 0) return {};
  if (n == 1) return {"1"};
  string prev = "0";
  string curr = "1";
  vector<string> res = {"1"};
  for (size_t i = 2; i <= n; ++i) {
    string next = sumPositive(prev, curr);
    res.push_back(next);
    prev = curr;
    curr = next;
  }
  return res;
}
    • get_fibs=[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229, 832040, 1346269, 2178309, 3524578, 5702887, 9227465, 14930352, 24157817, 39088169, 63245986, 102334155, 165580141, 267914296, 433494437, 701408733, 1134903170, 1836311903, 2971215073, 4807526976, 7778742049, 12586269025, 20365011074, 32951280099, 53316291173, 86267571272, 139583862445, 225851433717, 365435296162, 591286729879, 956722026041, 1548008755920, 2504730781961, 4052739537881, 6557470319842, 10610209857723, 17167680177565, 27777890035288, 44945570212853, 72723460248141, 117669030460994, 190392490709135, 308061521170129, 498454011879264, 806515533049393, 1304969544928657, 2111485077978050, 3416454622906707, 5527939700884757, 8944394323791464, 14472334024676221, 23416728348467685, 37889062373143906, 61305790721611591, 99194853094755497, 160500643816367088, 259695496911122585, 420196140727489673, 679891637638612258, 1100087778366101931, 1779979416004714189, 2880067194370816120, 4660046610375530309, 7540113804746346429, 12200160415121876738, 19740274219868223167, 31940434634990099905, 51680708854858323072, 83621143489848422977, 135301852344706746049, 218922995834555169026, 354224848179261915075]
    • using std::string;
    • using std::vector;
    • string sumPositive(const string &x, const string &y) {
    • size_t m = x.size(), n = y.size();
    • string res;
    • short acc = 0;
    • for (size_t i = 1; i <= m && i <= n; ++i) {
    • acc += x[m-i] - '0';
    • acc += y[n-i] - '0';
    • res.push_back(acc % 10 + '0');
    • acc /= 10;
    • }
    • for (size_t i = n + 1; i <= m; ++i) {
    • acc += x[m-i] - '0';
    • res.push_back(acc % 10 + '0');
    • acc /= 10;
    • }
    • for (size_t i = m + 1; i <= n; ++i) {
    • acc += y[n-i] - '0';
    • res.push_back(acc % 10 + '0');
    • acc /= 10;
    • }
    • if (acc > 0) res.push_back(acc + '0');
    • size_t s = res.size();
    • for (size_t i = 0; i < s / 2; ++i) {
    • char c = res[i];
    • res[i] = res[s-i-1];
    • res[s-i-1] = c;
    • }
    • return res;
    • }
    • vector<string> getFibs(size_t n) {
    • if (n == 0) return {};
    • if (n == 1) return {"1"};
    • string prev = "0";
    • string curr = "1";
    • vector<string> res = {"1"};
    • for (size_t i = 2; i <= n; ++i) {
    • string next = sumPositive(prev, curr);
    • res.push_back(next);
    • prev = curr;
    • curr = next;
    • }
    • return res;
    • }
AXER-docvs.KirubelYonas

Guess The Number Game

What's new:

  • Imported separate std::-s instead of entire namespace std
  • Implemented testing using string IO
Code
Diff
  • #include <iostream>
#include <cstdlib>
#include <ctime>
#include <vector>
#include <algorithm>
#include <cmath>
#include <random>

using std::cin;
using std::cout;
using std::endl;
using std::istream;
using std::make_pair;
using std::mt19937;
using std::ostream;
using std::pair;
using std::random_device;
using std::string;
using std::vector;

string generateRandomNumber() {
    vector<char> digits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};

    // Initialize random number generator
    random_device rd;  // Obtain a random number from hardware
    mt19937 g(rd());  // Seed the generator

    // Shuffle digits
    shuffle(digits.begin(), digits.end(), g);

    // Return the first 4 digits as a string
    return string(digits.begin(), digits.begin() + 4);
}

bool hasDuplicateDigits(const string &number) {
    vector<bool> seen(10, false);
    for (const auto c : number) {
        if (seen[c - '0']) return true;
        seen[c - '0'] = true;
    }
    return false;
}

bool isNumeric(const string &s) {
    return all_of(s.begin(), s.end(), [](char c){ return isdigit(c); });
}

string getUserGuess(istream &in = cin, ostream &out = cout) {
    string guess;
    out << "Enter your guess (a 4-digit number with non-repeating digits): ";
    in >> guess;
    return guess;
}

pair<int, int> checkGuess(const string &randomNumber, const string &userGuess) {
    int correctNumbers = 0;
    int correctPosition = 0;

    for (int i = 0; i < 4; ++i) {
        if (randomNumber[i] == userGuess[i]) {
            correctNumbers++;
            correctPosition++;
        } else if (count(randomNumber.begin(), randomNumber.end(), userGuess[i])) {
            correctNumbers++;
        }
    }

    return make_pair(correctNumbers, correctPosition);
}

int acceptGuess(const string &expected, istream &in = cin, ostream &out = cout) {
    int attempts = 0;
    while (true) {
        string userGuess = getUserGuess(in, out);
        if (userGuess.length() != 4 || hasDuplicateDigits(userGuess) || !isNumeric(userGuess)) {
            out << "Invalid input. Please enter a 4-digit number with non-repeating digits." << endl;
            continue;
        }
        auto [corNum, corPos] = checkGuess(expected, userGuess);
        out << "Correct numbers: " << corNum << " Correct position: " << corPos << endl;
        attempts++;
        if (corPos == 4) {
            out << "Congratulations! You guessed the number " << expected << " correctly in " << attempts << " attempts!" << endl;
            break;
        }
    }
    return attempts;
}

int _main(istream &in = cin, ostream &out = cout) {
    // Seed rand since random_shuffle _probably_ uses it.
    srand(static_cast<unsigned>(time(0)));
    string randomNumber = generateRandomNumber();
    acceptGuess(randomNumber, in, out);
    return 0;
}
    • #include <iostream>
    • #include <cstdlib>
    • #include <ctime>
    • #include <vector>
    • #include <algorithm>
    • #include <cmath>
    • #include <random>
    • using namespace std;
    • using std::cin;
    • using std::cout;
    • using std::endl;
    • using std::istream;
    • using std::make_pair;
    • using std::mt19937;
    • using std::ostream;
    • using std::pair;
    • using std::random_device;
    • using std::string;
    • using std::vector;
    • string generateRandomNumber() {
    • vector<char> digits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
    • // Initialize random number generator
    • random_device rd; // Obtain a random number from hardware
    • mt19937 g(rd()); // Seed the generator
    • // Shuffle digits
    • shuffle(digits.begin(), digits.end(), g);
    • // Return the first 4 digits as a string
    • return string(digits.begin(), digits.begin() + 4);
    • }
    • bool hasDuplicateDigits(const string &number) {
    • vector<bool> seen(10, false);
    • for (const auto c : number) {
    • if (seen[c - '0']) return true;
    • seen[c - '0'] = true;
    • }
    • return false;
    • }
    • bool isNumeric(const string &s) {
    • return all_of(s.begin(), s.end(), [](char c){ return isdigit(c); });
    • }
    • string getUserGuess() {
    • string getUserGuess(istream &in = cin, ostream &out = cout) {
    • string guess;
    • cout << "Enter your guess (a 4-digit number with non-repeating digits): ";
    • cin >> guess;
    • out << "Enter your guess (a 4-digit number with non-repeating digits): ";
    • in >> guess;
    • return guess;
    • }
    • pair<int, int> checkGuess(const string &randomNumber, const string &userGuess) {
    • int correctNumbers = 0;
    • int correctPosition = 0;
    • for (int i = 0; i < 4; ++i) {
    • if (randomNumber[i] == userGuess[i]) {
    • correctNumbers++;
    • correctPosition++;
    • } else if (count(randomNumber.begin(), randomNumber.end(), userGuess[i])) {
    • correctNumbers++;
    • }
    • }
    • return make_pair(correctNumbers, correctPosition);
    • }
    • int _main() {
    • // Seed rand since random_shuffle _probably_ uses it.
    • srand(static_cast<unsigned>(time(0)));
    • string randomNumber = generateRandomNumber();
    • int acceptGuess(const string &expected, istream &in = cin, ostream &out = cout) {
    • int attempts = 0;
    • while (true) {
    • string userGuess = getUserGuess();
    • string userGuess = getUserGuess(in, out);
    • if (userGuess.length() != 4 || hasDuplicateDigits(userGuess) || !isNumeric(userGuess)) {
    • cout << "Invalid input. Please enter a 4-digit number with non-repeating digits." << endl;
    • out << "Invalid input. Please enter a 4-digit number with non-repeating digits." << endl;
    • continue;
    • }
    • auto [corNum, corPos] = checkGuess(randomNumber, userGuess);
    • cout << "Correct numbers: " << corNum << " Correct position: " << corPos << endl;
    • auto [corNum, corPos] = checkGuess(expected, userGuess);
    • out << "Correct numbers: " << corNum << " Correct position: " << corPos << endl;
    • attempts++;
    • if (corPos == 4) {
    • cout << "Congratulations! You guessed the number " << randomNumber << " correctly in " << attempts << " attempts!" << endl;
    • out << "Congratulations! You guessed the number " << expected << " correctly in " << attempts << " attempts!" << endl;
    • break;
    • }
    • }
    • return attempts;
    • }
    • int _main(istream &in = cin, ostream &out = cout) {
    • // Seed rand since random_shuffle _probably_ uses it.
    • srand(static_cast<unsigned>(time(0)));
    • string randomNumber = generateRandomNumber();
    • acceptGuess(randomNumber, in, out);
    • return 0;
    • }
AXER-docvs.user2040513

Python 101 - Hello World - 1 (C++)

Code
Diff
  • #include <iostream>
#include <string>
using namespace std;

bool helloWorld() {
  return [](const string &H, const string &W){
    return (cout << H << W << endl).good();
  }("Hello, ", "World!");
}
    • //Created by RHB
    • // Your code here
    • #include <iostream>
    • #include <string>
    • using namespace std;
    • int main() {
    • string H, W;
    • H="Hello ";
    • W="World!";
    • cout << H << W << endl;
    • return 0;
    • bool helloWorld() {
    • return [](const string &H, const string &W){
    • return (cout << H << W << endl).good();
    • }("Hello, ", "World!");
    • }