题解 | #进制转换#

while(line = readline()){
    change(line)
}
function change(line) {
    let n = line.substring(2)
    let number = 0
    for(let i=0;i<n.length;i++) {
        let codeAt = n.charCodeAt(i)
        let num = 0
        switch(codeAt){
            case 48:
                num=0
                break
            case 49:
                num=1
                break
            case 50:
                num=2
                break
            case 51:
                num=3
                break
            case 52:
                num=4
                break
            case 53:
                num=5
                break
            case 54:
                num=6
                break
            case 55:
                num=7
                break
            case 56:
                num=8
                break
            case 57:
                num=9
                break
            case 65:
                num=10
                break
            case 66:
                num=11
                break
            case 67:
                num=12
                break
            case 68:
                num=13
                break
            case 69:
                num=14
                break
            case 70:
                num=15
                break
        }
        number = number*16+num
    }
    console.log(number)
}