Added some new files left out of last commit

itos.cpp

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+#include "itos.h"
+#include <stack>
+#include <cstdlib>
+
+using std::string;
+using std::stack;
+using std::abs;
+
+string itos(int val)
+{
+    string answer;
+    stack<int> stk;
+    int temp;
+
+    if (val < 0)
+    {
+	answer += "-";
+	val = abs(val);
+    }
+
+    while (val > 0)
+    {
+	temp = val % 10;
+	stk.push(temp);
+	val = val / 10;
+    }
+
+    if (stk.empty()) return "0";
+
+    while (!stk.empty())
+    {
+	temp = stk.top();
+	if (temp == 0) answer += '0';
+	else if (temp == 1) answer += '1';
+	else if (temp == 2) answer += '2';
+	else if (temp == 3) answer += '3';
+	else if (temp == 4) answer += '4';
+	else if (temp == 5) answer += '5';
+	else if (temp == 6) answer += '6';
+	else if (temp == 7) answer += '7';
+	else if (temp == 8) answer += '8';
+	else if (temp == 9) answer += '9';
+	stk.pop();
+    }
+
+    return answer;
+}

itos.h

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+/* itos.h
+Converts integer to string
+*/
+
+#ifndef _ITOS_H_
+#define _ITOS_H_
+
+#include <string>
+using std::string;
+
+string itos(int val);
+
+#endif