Added String Fibonacci

This programme uses String Addition to find Nth fibonacci.

Others/String Fibonacci.cpp

@@ -0,0 +1,73 @@
+//This Programme returns the Nth fibonacci as a string.
+//The method used is manual addition with carry and placing it in a string which is called string addition
+//This makes it have no bounds or limits
+
+
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+std::string add(std::string a, std::string b) 
+{ 
+    std::string temp = "";
+    while ((int)a.length() < (int)b.length()) 
+    {
+        a = "0" + a;
+    }
+    while ((int)b.length() < (int)a.length()) {
+        b = "0" + b;
+    }
+    int carry = 0;
+    for (int i = a.length() - 1; i >= 0; i--) 
+    {
+        char val = (char)(((a[i] - 48) + (b[i] - 48)) + 48 + carry);
+        if (val > 57) 
+        {
+            carry = 1;
+            val -= 10;
+        }
+        else 
+        {
+            carry = 0;
+        }
+        temp = val + temp;
+    }
+    if (carry != 0) 
+    {
+        temp = "1" + temp;
+    }
+    while (temp[0] == '0' && temp.length() != 1) 
+    {
+        temp = temp.substr(1);
+    }
+    return temp;
+}
+
+void fib_Accurate(long long n) 
+{
+    std::string tmp = "";
+    std::string fibMinus1 = "1";
+    std::string fibMinus2 = "0";
+    std::string comma = ", ";
+        for (long long i = 0; i < n; i++) 
+        {
+            tmp = add(fibMinus1, fibMinus2);
+            
+            fibMinus2 = fibMinus1;
+            fibMinus1 = tmp;
+    	}
+    std::cout <<  fibMinus2;
+}
+
+
+int main() 
+{
+    int n;
+    cout << "Enter whatever number N you want to find the fibonacci of\n";
+    cin >> n;
+    cout << n << " th Fibonacci is \n";
+	  fib_Accurate(n);
+    
+	return 0;
+}