conversion.cpp

#include <iostream>
// #include<bits/stdc++.h>
#include <string.h>
using namespace std;
int binaryToDecimal(int n)
{
    int ans = 0;
    int x = 1;
    while (n > 0)
    {
        int y = n % 10;
        ans += x * y;
        x *= 2;
        n /= 10;
    }
    return ans;
}
int octalToDecimal(int n)
{
    int ans = 0;
    int x = 1;
    while (n > 0)
    {
        int y = n % 10;
        ans += x * y;
        x *= 8;
        n /= 10;
    }
    return ans;
}
int hexadecimalToDecimal(string n)
{
    int ans = 0;
    int x = 1;
    int s = n.size();
    for (int i = s - 1; i >= 0; i--)
    {
        if (n[i] >= '0' && n[i] <= '9')
        {
            ans += x * (n[i] - '0');
        }
        else if (n[i] >= 'A' && n[i] <= 'F')
        {
            ans += x * (n[i] - 'A' + 10);
        }
        x *= 16;
    }
    return ans;
}
int decimalToBinary(int n)
{
    int x = 1;
    int ans = 0;
    while (x <= n)
    {
        x *= 2;
    }
    x /= 2;
    while (x > 0)
    {
        int lastDigit = n / x;
        n -= lastDigit * x;
        x /= 2;
        ans = ans * 10 + lastDigit;
    }
    return ans;
}
int decimalToOctal(int n)
{
    int x = 1;
    int ans = 0;
    while (x <= n)
    {
        x *= 8;
    }
    x /= 8;
    while (x > 0)
    {
        int lastDigit = n / x;
        n -= lastDigit * x;
        x /= 8;
        ans = ans * 10 + lastDigit;
    }
    return ans;
}
string decimalToHexadecimal(int n)

{
    int x = 1;
    string ans = "";
    while (x <= n)

        x *= 16;
    x /= 16;
    while (x > 0)
    {
        int lastDigit = n / x;
        n -= lastDigit * x;
        x /= 16;
        if (lastDigit <= 9)
        {
            ans = ans + to_string(lastDigit);
        }
        else
        {
            char c = 'A' + lastDigit - 10;
            ans.push_back(c);
        }
        
    }
    return ans;
}

int main()
{
    int n;
    // string n;
    cout << "Enter the Num\n";
    cin >> n;
    // cout<<binaryToDecimal(n)<<endl;
    // cout<<octalToDecimal(n)<<endl;
    //   cout<<hexadecimalToDecimal(n)<<endl;
    //  cout<<decimalToBinary(n)<<endl;
    // cout<<decimalToOctal(n)<<endl;
    cout << decimalToHexadecimal(n) << endl;

    return 0;
}