diff --git a/exercice_2/src/main.cc b/exercice_2/src/main.cc
index 49af90b..f0613bc 100644
--- a/exercice_2/src/main.cc
+++ b/exercice_2/src/main.cc
@@ -1,51 +1,51 @@
 /* created by Marti Bosch and Marc Schwaerzel*/
 /* -------------------------------------------------------------------------- */
 #include <cstdlib>
 #include <stdlib.h>
 #include <iostream>
 #include <sstream>
 
 #include "compute_arithmetic.hh"
 #include "compute_pi.hh"
 #include "print_series.hh"
 #include "series.hh"
 
 using namespace std;
 /* -------------------------------------------------------------------------- */
 
 int main(int argc, char **argv) {
   	cout << "exercice 2" << endl;
-	cout << "please enter the following arguments: serie_type(1=arithmetic, 2=pi), maxiter" << endl;
+	cout << "please enter the following arguments: serie_type(arithmetic or pi), maxiter(N)" << endl;
 
 if (argc != 3) {
 
     std::cout << "\nincorrect number of input arguments\n"
               << std::endl;
 
     return EXIT_FAILURE;
   }
 
 
-int serie_type = atoi(argv[1]);
+string serie_type = argv[1];
 int N = atoi(argv[2]);
 
 Series* my_object;  
 
-if (serie_type == 1){
+if (serie_type == "arithmetic"){
 		my_object = new ComputeArithmetic();
 		cout <<"I compute arithmetic"<< endl;
 	}
-else if (serie_type == 2){
+else if (serie_type == "pi"){
 		my_object = new ComputePi();
 		cout <<"\nI compute pi"<< endl;
 	}
 
 double res = my_object->compute(N);
 cout << "result for test for ex 2.6:\t" << res <<endl;
 delete my_object;
 
 
 
 
 }