Create 0012-roman-to-integer.c

Author: Vedant Kanabar

c/0013-roman-to-integer.c

@@ -0,0 +1,42 @@
+int value(char c){
+
+    switch(c) {
+        case 'I': return 1;
+        case 'V': return 5;
+        case 'X': return 10;
+        case 'L': return 50;
+        case 'C': return 100;
+        case 'D': return 500;
+        case 'M': return 1000;
+        default: return 0;
+    }
+}
+
+int romanToInt(char * s){
+    int len = 0;
+    int sum = 0;
+    int valueCurrent, valueNext;
+
+    len = strlen(s);
+
+    for(int i=0; i<len; i++) {
+        
+        valueCurrent = value(s[i]);
+
+        if((i+1) < len) {
+            valueNext = value(s[i+1]);
+        }
+        else { 
+            valueNext = 0;
+        }
+
+        if(valueNext > valueCurrent) {
+            sum = sum - valueCurrent;
+        }
+        else {
+            sum = sum + valueCurrent;
+        }
+    }
+    
+    return sum;
+}