Ading source

lychrel.cpp

@@ -0,0 +1,52 @@
+#include <iostream>
+#include <cstring>
+#include "lychrel.hpp"
+
+long long get_len (string a, string b) {
+
+    return a.length() == b.length() ? a.length(): -1;
+
+}
+
+string add (string a, string b) {
+    
+    long long len = get_len(a,b);
+    
+    char result[len + 2] = { '0' };
+
+    if(len == -1) {
+        return "-1";
+    } else {
+	int reg = 0;
+	for(long long i = len +1; i >= 0; i--) {
+	    long long rescount = i;
+	    long long numcount = i - 1;
+	    if(rescount == 0) {
+		result[rescount] = (char) reg + '0';
+	    } else {
+		    int x = a[numcount] - '0';
+		    int y = b[numcount] - '0';
+		    int temp = x+y+reg;
+		    if(temp > 9) {
+			result[rescount] = (char) temp - 10 + '0';
+			reg = 1;
+		    } else {
+			result[rescount] = (char) temp + '0';
+			reg = 0;
+		    }
+	    }
+	}
+
+    }
+    result[len+1] = '\0';
+    string  finresult = result;
+    if(result[0] == 0 + '0') 
+	    finresult.erase(0,1);
+    return finresult;
+
+}
+
+bool is_palindrome (string str) {
+    return str == string(str.rbegin(),str.rend());
+} 
+

lychrel.hpp

@@ -0,0 +1,8 @@
+#include <iostream>
+#include <cstring>
+
+using namespace std;
+
+long long get_len (string a, string b);
+string add (string a, string b);
+bool is_palindrome (string str);

main.cpp

@@ -0,0 +1,23 @@
+#include <iostream>
+#include <cstring>
+#include "lychrel.hpp"
+
+
+int main(int argc, char **argv)
+{
+    string a = argv[1];
+    string b(a.rbegin(),a.rend());
+    string added = add(a,b);
+    long long it = 0;
+    do {
+        cout << "Iteration " << ++it << " currently working on " << added <<  endl;	
+	a = added;
+        b = string(a.rbegin(),a.rend());
+        added = add(a,b);
+    } while(! is_palindrome(added) );
+    cout << "Iteration " << ++it << " currently working on " << added <<  endl;	
+    cout << "That consists of\n" << a << "\n+\n" << b << "\nand that it is a palindrome." << endl;	
+
+
+    return 0;
+}