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Merged
merged 2 commits into from
Mar 19, 2019
Merged

Add Roman To Integer conversion #720

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c14af04
Add Roman To Integer conversion
pandeyarun709 Mar 18, 2019
971d5f7
Format code in RomanToInteger.java
yanglbme Mar 19, 2019
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Add Roman To Integer conversion
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@pandeyarun709
pandeyarun709 committed Mar 18, 2019
commit c14af04b58ae356c51eca663dcc34d421858dba8
60 changes: 60 additions & 0 deletions Conversions/RomanToInteger.java
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import java.util.*;
public class RomanToInteger {

/*
This function convert Roman number into Integer
@param A is Roman number string
*/
public static int romanToInt(String A) {
Map<Character , Integer> map = new HashMap<>();
map.put('I' , 1);
map.put('V' , 5);
map.put('X' , 10);
map.put('L' , 50);
map.put('C' , 100);
map.put('D' , 500);
map.put('M' , 1000);

char c = A.charAt(A.length()-1);
char prev = ' ';

int sum =0;

int newPrev = 0, currentNum =0;
for(int i = A.length() -1;i>=0;i--)
{
c = A.charAt(i);


if(prev != ' ') {
//checking current Number greater then previous or not
newPrev = map.get(prev) > newPrev ? map.get(prev) : newPrev ;
}


currentNum = map.get(c);

if(currentNum >= newPrev ) //if current number greater then prev max previous then add
{
sum += currentNum;
}
else {

sum -= currentNum; // subtract upcoming number until upcoming number not greater then prev max
}

prev = c;
}

return sum;
}


public static void main(String[] args) {


int sum = romanToInt("MDCCCIV") ;
System.out.println(sum);
}

}