JAVA Roman to Integer 羅馬數轉換為int型方法
阿新 • • 發佈：2019-02-08
public int romanToInt(String s) {
int result=0;
for (int i = 0; i < s.length(); i++) {
char tail=s.charAt(i);
switch (tail) {
case 'I':result=result+1;
break;
case 'V':if (i>0&&s.charAt(i-1)=='I') {
result=result+3;
}
else {
result=result+5;
}
break;
case 'X':
if (i>0&&s.charAt(i-1)=='I') {
result=result+8;
}
else {
result=result+10;
}
break;
case 'L':
if (i>0&&s.charAt(i-1)=='X') {
result=result+30;
}
else {
result=result+50;
}
break;
case 'C':
if (i>0&&s.charAt(i-1)=='X') {
result=result+80;
}
else {
result=result+100;
}
break;
case 'D':
if (i>0&&s.charAt(i-1)=='C') {
result=result+300;
}
else {
result=result+500;
}
break;
case 'M':
if (i>0&&s.charAt(i-1)=='C') {
result=result+800;
}
else {
result=result+1000;
}
break;
default:
break;
}
}
return result;
int result=0;
for (int i = 0; i < s.length(); i++) {
char tail=s.charAt(i);
switch (tail) {
case 'I':result=result+1;
break;
case 'V':if (i>0&&s.charAt(i-1)=='I') {
result=result+3;
}
else {
result=result+5;
}
break;
case 'X':
if (i>0&&s.charAt(i-1)=='I') {
result=result+8;
}
else {
result=result+10;
}
break;
case 'L':
if (i>0&&s.charAt(i-1)=='X') {
result=result+30;
}
else {
result=result+50;
}
break;
case 'C':
if (i>0&&s.charAt(i-1)=='X') {
result=result+80;
}
else {
result=result+100;
}
break;
case 'D':
if (i>0&&s.charAt(i-1)=='C') {
result=result+300;
}
else {
result=result+500;
}
break;
case 'M':
if (i>0&&s.charAt(i-1)=='C') {
result=result+800;
}
else {
result=result+1000;
}
break;
default:
break;
}
}
return result;