function pointer

This program is used to leran the function pointer

cpp four.hpp

@@ -0,0 +1,32 @@
+//The use of the function pointer
+#include <iostream>
+using namespace std;
+double sam(int minutes);
+double sufei(int minutes);
+void sum(int count, double(*p)(int));
+void sum(int count, double(*p)(int))	//The return value of a function and parameters need to declare
+{
+	cout << count<<endl << "it will take:";
+	cout << (*p)(count) << endl;
+}
+double sam(int minutes)
+{
+	return 0.5*minutes;
+}
+double sufei(int minutes)
+{
+	return 0.4*minutes;
+}
+int main()
+{
+	int code;
+	cout << "please input a number:" << endl;
+	cin >> code;
+	cout << "Here is sam's time:";
+	sum(code, sam);		//The function name as address directly
+	cout << "Here is sufei's sum:";
+	sum(code, sufei);
+	cin.get();
+	cin.get();
+    return 0;
+}