#!/bin/bash

set -euo pipefail

function assert_format() {
    if ! [[ "$1" == "0x"* ]]
    then
        echo "0x$1"
    else
        echo "$1"
    fi
}

if [ $# = 1 ]
then
    val=$(assert_format "$1")
    printf "%d\n" "$val"
elif [ $# -gt 1 ]
then
    for i in "$@"
    do
        val=$(assert_format "$i")
        printf "%X = %d\n" "$val" "$val"
    done
else
    echo "Usage: $0 <hexadecimal>"
fi