Revision 115:8bd6e72f6e28, committed 2021-10-13

Comitter:

CSTritt

Date:

Wed Oct 13 15:51:01 2021 +0000

Parent:

114:1cfad1babb55

Commit message:

First v5 version. Note how twisted this is. Outer count is incremented in while test expression.

Changed in this revision

--- a/main.cpp	Tue Oct 12 21:48:12 2021 +0000
+++ b/main.cpp	Wed Oct 13 15:51:01 2021 +0000
@@ -1,5 +1,5 @@
 /*
-Project: 21_ScopeEx1_v5
+Project: 21_ScopeEx2_v5
 File: main.cpp
 
  This simple program demonstrates that C passes arguments by value.
@@ -18,17 +18,14 @@
     const char ESC = 27; // Define escape character for escape sequence.
     printf("%c[2J%c[H", ESC, ESC); // ANSI/VT100 clear screen/home.
 
-    int count1 = 1; // Declared in outer block
+    int count = 0; // Declared in outer block.
+    do {
+        int count = 0; // This is another variable called count.
+        ++count; // this applies to inner count.
+        printf("count = %d\n", count);
+    } while( ++count <= 5); // This works with outer count.
 
-    do { // Do while construct may be new to you!
-        int count2 = 0; // Declared & initialized in inner block
-        ++count2; // Ineffective due to line above!
-        printf("count1 = %d count2 = %d\n", count1, count2);
-    // Note that count1 is incremented in while test! 
-    } while (++count1 <= 5);  // count2 no longer exists after loop exit.
-
-    printf("count1 = %d\n", count1);
-    return 0;
+    printf("count = %d\n", count); // Inner count is dead.
 
     while(true) {  // Main forever loop.
         ThisThread::sleep_for(DELAY); // Pause