update express5.3

update assign 4.13

Author: lulongfei

assign4.13.10.cpp

@@ -5,14 +5,7 @@ int main()
 {
     std::array<float, 3> data;
     std::cout << "Please input three times running record: " << std::endl;
-
-    std::cin >> data[0];
-    std::cin >> data[1];
-    std::cin >> data[2];
-
-    //data.at(0) = firstTime;
-    //data.at(1) = secondTime;
-    //data.at(2) = thirdTime;
+    std::cin >> data[0] >> data[1] >> data[2];
 
     int times = data.size();
     float average = (data[0] + data[1] + data[2]) / times;

express5.3.cpp

@@ -0,0 +1,22 @@
+#include <iostream>
+
+int main()
+{
+    using namespace std;
+    int x;
+
+    cout << "The expression x = 100 has the value ";
+    cout << (x = 100) << endl;
+    cout << "Now x = " << x << endl;
+    cout << "The expression x < 3 has the value ";
+    cout << (x < 3) << endl;
+    cout << "The expression x > 3 has the value ";
+    cout << (x > 3) << endl;
+    cout.setf(ios_base::boolalpha);
+    cout << "The expression x < 3 has the value ";
+    cout << (x < 3) << endl;
+    cout << "The expresion x > 3 has the value ";
+    cout << (x > 3) << endl;
+
+    return 0;
+}

formore.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+
+const int ArSize = 16;
+
+int main()
+{
+    long long factorials[ArSize];
+    factorials[1] = factorials[0] = 1LL;
+    for(int i = 2; i < ArSize; i++)
+    {
+        factorials[i] = i * factorials[i-1];
+    }
+    for(int i = 0; i < ArSize; i++)
+    {
+        std::cout << i << "! = " << factorials[i] << std::endl;
+    }
+    return 0;
+}