hexadecimaltodecimal

// C++ program to convert hexadecimal to decimal 
#include<iostream> 
#include<string.h> 
using namespace std; 
  
// Function to convert hexadecimal to decimal 
int hexadecimalToDecimal(char hexVal[]) 
{    
    int len = strlen(hexVal); 
      
    // Initializing base value to 1, i.e 16^0 
    int base = 1; 
      
    int dec_val = 0; 
      
    // Extracting characters as digits from last character 
    for (int i=len-1; i>=0; i--) 
    {    
        // if character lies in '0'-'9', converting  
        // it to integral 0-9 by subtracting 48 from 
        // ASCII value. 
        if (hexVal[i]>='0' && hexVal[i]<='9') 
        { 
            dec_val += (hexVal[i] - 48)*base; 
                  
            // incrementing base by power 
            base = base * 16; 
        } 
  
        // if character lies in 'A'-'F' , converting  
        // it to integral 10 - 15 by subtracting 55  
        // from ASCII value 
        else if (hexVal[i]>='A' && hexVal[i]<='F') 
        { 
            dec_val += (hexVal[i] - 55)*base; 
          
            // incrementing base by power 
            base = base*16; 
        } 
    } 
      
    return dec_val; 
} 
  
// Driver program to test above function 
int main() 
{ 
    char hexNum[] = "1A";     
    cout << hexadecimalToDecimal(hexNum) << endl; 
    return 0; 
}