diff --git a/4.cpp b/4.cpp
new file mode 100644
index 0000000..d948aa6
--- /dev/null
+++ b/4.cpp
@@ -0,0 +1,21 @@
+#include <bits/stdc++.h>
+using namespace std;
+int main(int argc, char *argv[])
+{
+	int a = atoi(argv[1]);
+	char b = argv[2][0];
+	switch (b)
+	{
+		case 's':
+			{
+				cout << sqrt(a);
+				break;
+			}
+		case 'c':
+			{
+				cout << cos(a);
+				break;
+			}
+	}
+	return 0;
+}