Made By Nasr

#include <iostream>
#include <math.h>
using namespace std;
void printMainMenu(){
  cout << "\n+--------------+[[ Main Menu ]]+--------------+\n";
  cout << "a.Sin (x), Series.\n"
  << "b.Count Perfects, Count Digits and Prime Number.\n"
  << "c.Binary and Decimal.\n"
  << "d.Exit.\n"
  << "Your Choice: ";
}

void printAMenu(){
  cout << "\n+--------------+[[ A Menu ]]+--------------+\n";
  cout << "1- Sin (x) = x - x^3/3! + x^5/5! - x^7/7! ... x^n/n!\n"
  << "2- F = 1^2/3! + 3^6/7! ... n^2n/(2n+1)!\n"
  << "3- Return to the Main Menu\n"
  << "Enter Your Choice: ";
}

void printBMenu(){
  cout << "\n+--------------+[[ B Menu ]]+--------------+\n";
  cout << "1- Sum Perfects.\n"
  << "2- Count Of Primes.\n"
  << "3- Return to the Main Menu\n"
  << "Enter Your Choice: ";
}

void printCMenu(){
  cout << "\n+--------------+[[ C Menu ]]+--------------+\n";
  cout << "1- Binary To Decimal.\n"
  << "2- Decimal To Binary.\n"
  << "3- Return to the Main Menu\n"
  << "Enter Your Choice: ";
}

float A_Menu_Choice_One(int x, int n){
  float result = 0;
  int factorial = 1;
  for(int i = 1; i <= n; i += 2){
    for(int j = 1; j <= i; j++) factorial *= j;
    result += (pow(x, i * 1.0) / factorial * 1.0) * pow(-1.0, i+1);
  }
  return result;
}

float A_Menu_Choice_Two(int n){
  float result = 0;
  int factorial = 1;
  for(int i = 1; i <= n; i += 2){
    for(int j = 1; j <= i*2 + 1; j++) factorial *= j;
    result += pow(i, 2 * i * 1.0) / factorial * 1.0;
  }
  return result;
}

int B_Menu_Choice_One(){
  int total = 0, sum;
  for(int i = 1; i <= 1000; i++){
    sum = 0;
    for(int j = 1; j < i; j++){
      if(i % j == 0){
        sum += j;
      }
    }
    if(sum == i){
      total += i;
    }
  }
  return total;
}

int B_Menu_Choice_Two(){
  int count = 0, flag;
  for(int i = 2; i <= 100; i++){
    flag = 1;
    for(int j = 2; j <= i/2; j++){
      if(i % j == 0){
        flag = 0;
      }
    }
    if(flag){
      count++;
    }
  }
  return count;
}

long long int C_Menu_Choice_One(long long int n){
  long long int decimalNum = 0, rem, tmp = 1;
  while(n > 0){
    rem = n % 10;
    decimalNum += rem * tmp;
    tmp *= 2;
    n /= 10;
  }
  return decimalNum;
}

int C_Menu_Choice_Two(int n){
  int binaryNum = 0, powerOfTen = 1;

  do
  {
  binaryNum=binaryNum+(n%2)*powerOfTen;
  powerOfTen *= 10;
  n=n/2;
  }
  while(n>0);
  return binaryNum;
}

int main() {
    char choice;
    while(2021)
    {
      printMainMenu();
      cin >> choice;
      if(choice == 'd' || choice == 'D') break;
      else if(choice == 'a' || choice == 'A'){
        int x, n, Achoice;
        printAMenu();
        cin >> Achoice;
        if(Achoice == 3) continue;
        else if(Achoice == 1){
          cout << "Enter x then n: ";
          cin >> x >> n;
          cout << " [!] - The Result of Sin(x) is: " << A_Menu_Choice_One(x, n) << endl;
        }
        else if(Achoice == 2){
          cout << "Enter n: ";
          cin >> n;
          cout << " [!] - The Result Of The Seris Is: " << A_Menu_Choice_Two(n) << endl;
        }else{
          cout << "\nInvalid Input\n";
        }
      }
      else if(choice == 'b' || choice == 'B'){
        int Bchoice;
        printBMenu();
        cin >> Bchoice;
        if(Bchoice == 3) continue;
        else if(Bchoice == 1){
          cout << " [!] - The Sum of Perfects Numbers From 1 to 1000 Is: " << B_Menu_Choice_One() << endl;
        }
        else if(Bchoice == 2){
          cout << " [!] - The Count of Prime Numbers From 1 to 100 Is: " << B_Menu_Choice_Two() << endl;
        }
        else{
          cout << "\nInvalid Input\n";
        }
      }
      else if(choice == 'c' || choice == 'C'){
        int Cchoice;
        printCMenu();
        cin >> Cchoice;
        if(Cchoice == 3) continue;
        else if(Cchoice == 1){
          long long int n;
          cout << "Enter A Binary Number: ";
          cin >> n;
          cout << " [!] - The Decimal Number Of That Binary Number is: " << C_Menu_Choice_One(n) << endl;
        }
        else if(Cchoice == 2){
          int n;
          cout << "Enter A Decimal Number: ";
          cin >> n;
          cout << " [!] - The Binary Number Of That Decimal Number is: " << C_Menu_Choice_Two(n) << endl;
        }
        else{
          cout << "\nInvalid Input\n";
        }
      }
      else{
        cout << "\nInvalid Input\n";
      }
    }
    cout << "\n[+] - The End Of The Program!\n";
  return 0;
}