题解 | #进制转换#

import java.util.;
public class Main{
public static void main(String[] args){
Scanner in=new Scanner(System.in);
while(in.hasNext()){
String num=in.next();
int all=0;
int chengsu=1;
char[] charAarry=num.toCharArray();
for (int i = 2; i < charAarry.length; i++) {
if(charAarry.length-i-1>0) {
for(int j=1;j<charAarry.length-i;j++) {
chengsu=16chengsu;
}
switch (charAarry[i]) {
case '0':
all=all+0chengsu;chengsu=1;
break;
case '1':
all=all+1chengsu;chengsu=1;
break;
case '2':
all=all+2chengsu;chengsu=1;
break;
case '3':
all=all+3chengsu;chengsu=1;
break;
case '4':
all=all+4chengsu;chengsu=1;
break;
case '5':
all=all+5chengsu;chengsu=1;
break;
case '6':
all=all+6chengsu;chengsu=1;
break;
case '7':
all=all+7chengsu;chengsu=1;
break;
case '8':
all=all+8chengsu;chengsu=1;
break;
case '9':
all=all+9chengsu;chengsu=1;
break;
case 'A':
all=all+10chengsu;chengsu=1;
break;
case 'B':
all=all+11chengsu;chengsu=1;
break;
case 'C':
all=all+12chengsu;chengsu=1;
break;
case 'D':
all=all+13chengsu;chengsu=1;
break;
case 'E':
all=all+14chengsu;chengsu=1;
break;
case 'F':
all=all+15chengsu;chengsu=1;
break;
default:
break;
}
}else {
switch (charAarry[i]) {
case '1':
all=all+1;
break;
case '2':
all=all+2;
break;
case '3':
all=all+3;
break;
case '4':
all=all+4;
break;
case '5':
all=all+5;
break;
case '6':
all=all+6;
break;
case '7':
all=all+7;
break;
case '8':
all=all+8;
break;
case '9':
all=all+9;
break;
case 'A':
all=all+10;
break;
case 'B':
all=all+11;
break;
case 'C':
all=all+12;
break;
case 'D':
all=all+13;
break;
case 'E':
all=all+14;
break;
case 'F':
all=all+15;
break;
default:
break;
}
}
} System.out.println(all);
}
}
}