Convert from hex to decimal c++

Convert a hexadecimal number into decimal c++

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    int x;
    cin >>hex >> x;
    cout << x << endl;
    return 0;
}

Source: stackoverflow.com

Convert from hex to decimal c++

#include <iostream>
#include <string>
#include "math.h"
using namespace std;
unsigned long hex2dec(string hex)
{
    unsigned long result = 0;
    for (int i=0; i<hex.length(); i++) {
        if (hex[i]>=48 && hex[i]<=57)
        {
            result += (hex[i]-48)*pow(16,hex.length()-i-1);
        } else if (hex[i]>=65 && hex[i]<=70) {
            result += (hex[i]-55)*pow(16,hex.length( )-i-1);
        } else if (hex[i]>=97 && hex[i]<=102) {
            result += (hex[i]-87)*pow(16,hex.length()-i-1);
        }
    }
    return result;
}

int main(int argc, const char * argv[]) {
    string hex_str;
    cin >> hex_str;
    cout << hex2dec(hex_str) << endl;
    return 0;
}

Source: stackoverflow.com

Similar codes

0 vote151 views1 answer
Decising how many numbers after comma c++
C++
2 votes149 views1 answer
Pointer dereference
C++
1 vote148 views1 answer
C++ isalphanum
C++
1 vote146 views1 answer
How to get a letter from the user c++ string
C++
0 vote155 views1 answer
Qrandomgenerator bounded
C++
0 vote143 views7 answers
Hexo
C++
0 vote154 views1 answer
What is c++ used for
C++
4 votes141 views2 answers
String count occurrences c++
C++
4 votes166 views3 answers
Convert int to binary string c++
C++
-1 vote144 views1 answer
A[12] = h + A[8]
C++