1 files changed, 29 insertions, 0 deletions
diff --git a/4p21.cpp b/4p21.cpp
new file mode 100644
index 0000000..0be1faa
--- /dev/null
+++ b/4p21.cpp
@@ -0,0 +1,29 @@
+#include <iostream>
+#include <vector>
+
+/*
+ *
+ * 4.21
+ *
+ *
+ */
+
+int main () {
+
+	std::vector<int> odddouble = {1,34,53,11,2,35,442,90,100,23,20,33,10,40,20,50};
+	for(auto a : odddouble) {
+		std::cout << a << " ";
+	}
+	
+	std::cout << std::endl;
+	for(auto &a : odddouble) {
+		a = a % 2 ? a * 2 : a ;
+	}
+
+	for(auto a : odddouble) {
+		std::cout << a << " ";
+	}
+	
+	std::cout << std::endl;
+	return 0;
+}