rome2arabic

numbers/rome2arabic.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <string.h>
+#define LEN 7
+
+const char rome[] = {'I', 'V', 'X', 'L', 'C', 'D', 'M'};
+const int arabic[] = {1, 5, 10, 50, 100, 500, 1000};
+
+int find_eq(char c);
+
+int main() {
+	int cur, next;
+	int res = 0;
+	int i;
+	char s[4000];
+
+	scanf("%s", s);
+	
+	for (i = 0; i < (int)strlen(s) - 1; ++i) {
+		cur = find_eq(s[i]);
+		next = find_eq(s[i+1]); 
+		if (cur < next) {
+			res -= cur;
+		}
+		else 
+			res += cur;
+	}
+
+	res += find_eq(s[i]);
+
+	printf("%d", res);
+	return 0;
+}
+
+int find_eq(char c) {
+	int i;
+	for (i = 0; (c != rome[i]) && (i < LEN); ++i);	
+	return arabic[i];
+}