diff --git "a/S\303\251rie 13/stdin_read.cc" "b/S\303\251rie 13/stdin_read.cc"
new file mode 100644
index 0000000..0880c8c
--- /dev/null
+++ "b/S\303\251rie 13/stdin_read.cc"	
@@ -0,0 +1,43 @@
+// stdin_read.cc
+// Auteur : Quentin Berling
+// Version : 1.0
+#include <iostream>
+#include <string>
+using namespace std;
+
+bool is_number(const string &s);
+
+int main() {
+	int i(0), a(0);
+	string cstring;
+
+	while(cin) {
+		cin >> cstring;
+		if (is_number(cstring) == true) {
+			a+=stoi(cstring);
+			cstring.clear();
+			++i;
+		}
+	}
+	
+	if (i > 0) { 
+		cout << "La moyenne des entiers entrés  est " << 1.0*a/i << "." << endl;
+	}
+
+	return 0;
+}
+
+bool is_number(const string &s) {
+	std::string::const_iterator it = s.begin();
+	while (it != s.end() && (std::isdigit(*it) || (*it == '-'))) 
+		++it;
+	return !s.empty() && it == s.end();
+// 	size_t nb(0);
+// 	if (s.size() != 0) {
+// 		long x=stol(s, &nb);
+// 	} else {
+// 		return 0;
+// 	}
+// 	
+// 	return (nb == s.size());
+}