performance - Convert a hexadecimal string to an integer efficiently in C? - Stack Overflow

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Tue Nov 15 2022 01:22:50 GMT+0000 (Coordinated Universal Time)

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#include "math.h"
#include "stdio.h"
///////////////////////////////////////////////////////////////
//  The bits arg represents the bit say:8,16,32...                                                                                                              
/////////////////////////////////////////////////////////////
volatile long Hex_To_Int(long Hex,char bits)
{
    long Hex_2_Int;
    char byte;
    Hex_2_Int=0;

    for(byte=0;byte<bits;byte++)
    {
        if(Hex&(0x0001<<byte))
            Hex_2_Int+=1*(pow(2,byte));
        else
            Hex_2_Int+=0*(pow(2,byte));
    }

    return Hex_2_Int;
}
///////////////////////////////////////////////////////////////
//                                                                                                                  
/////////////////////////////////////////////////////////////

void main (void)
{
    int Dec;   
    char Hex=0xFA;
    Dec= Hex_To_Int(Hex,8);  //convert an 8-bis hexadecimal value to a number in base 10
    printf("the number is %d",Dec);
}
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https://stackoverflow.com/questions/10324/convert-a-hexadecimal-string-to-an-integer-efficiently-in-c