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--- cpp:basic_data_types [2019/04/12 08:34] – [Αυτόματη εξαγωγή τύπου δεδομένων] gthanos
+++ cpp:basic_data_types [2021/04/25 15:02] – [Αυτόματη εξαγωγή τύπου δεδομένων] gthanos
@@ Line 50: / Line 50: @@
   int b(3);              // initial value: 3
   int c{2};              // initial value: 2
-  int result;            // initial value undetermined
   a = a + b;
-  result = a - c;
+  cout << "a: " << a << endl;  // endl stands for newline
-  cout << result;
+  b = a - c;
+  cout << "b: " << b << endl;
   return 0;
@@ Line 70: / Line 71: @@
 int main ()
 {
-  int a{5};               // initial value: 5
+  int a{5};               // initial value: 5, sizeof int
-  long b(3);              // initial value: 3
+  long b(3);              // initial value: 3  sizeof long
-  auto result = a + b;
+  auto result = a + b;    // compiler automatically extracts the variable type.
-  cout << result;
+  cout << "sizeof(result): " << sizeof(result) << endl;
+  cout << "sizeof(int): " << sizeof(int) << endl;
+  cout << "sizeof(long): " << sizeof(long) << endl;
   return 0;
@@ Line 89: / Line 93: @@
 {
   int a{5};               // initial value: 5
-  int b(3);              // initial value: 3
+  long b(3);              // initial value: 3
-  decltype(a) result;
+  decltype(b) result;
-  result = a + b;
+  cout << "sizeof(result): " << sizeof(result) << endl;
-  cout << result << endl;
+  cout << "sizeof(int): " << sizeof(int) << endl;
+  cout << "sizeof(long): " << sizeof(long) << endl;
   return 0;