Hexadecimal to Decimal Conversion using C program

/*program to convert number from hexadecimal to decimal*/

#include <stdio.h>
#include <string.h>
#include <math.h>

int main()
{
    char hex[32] = { 0 };
    int dec, i;
    int cnt; /*for power index*/
    int dig; /*to store digit*/

    printf("Enter hex value: ");
    gets(hex);

    cnt = 0;
    dec = 0;
    for (i = (strlen(hex) - 1); i >= 0; i--) {
        switch (hex[i]) {
        case 'A':
            dig = 10;
            break;
        case 'B':
            dig = 11;
            break;
        case 'C':
            dig = 12;
            break;
        case 'D':
            dig = 13;
            break;
        case 'E':
            dig = 14;
            break;
        case 'F':
            dig = 15;
            break;
        default:
            dig = hex[i] - 0x30;
        }
        dec = dec + (dig)*pow((double)16, (double)cnt);
        cnt++;
    }

    printf("DECIMAL value is: %d", dec);
    return 0;
}

Output:

    Enter hex value: AF6
    DECIMAL value is: 2806