Diff: main.cpp

Revision:

114:1cfad1babb55

Parent:

113:cc5beacdad5a

--- a/main.cpp	Mon Oct 11 12:45:46 2021 +0000
+++ b/main.cpp	Tue Oct 12 21:48:12 2021 +0000
@@ -1,41 +1,36 @@
 /*
-Project: 21_GlobalEx_v5
+Project: 21_ScopeEx1_v5
 File: main.cpp
 
  This simple program demonstrates that C passes arguments by value.
- 
- Uses VT-100 escape sequences to prevent scrolling. See 
- http://www.csie.ntu.edu.tw/~r92094/c++/VT100.html and/or 
+
+ Uses VT-100 escape sequences to prevent scrolling. See
+ http://www.csie.ntu.edu.tw/~r92094/c++/VT100.html and/or
  https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797.
- 
+
  Written by: Dr. C. S. Tritt; Last revised 10/11/21 (v. 1.1)
 */
 #include "mbed.h"
 
-int myFunc(int x, int y); // Function declaration required.
+int main()
+{
+    const int DELAY = 2000000;; // mS wait time.
+    const char ESC = 27; // Define escape character for escape sequence.
+    printf("%c[2J%c[H", ESC, ESC); // ANSI/VT100 clear screen/home.
 
-// Arbitrary factor. Unitless. Move into main to break project.
-const float myFactor = 3.3f; // Suffix f indicates float (default is double).
+    int count1 = 1; // Declared in outer block
 
-int main() {
-    const int DELAY = 2000;; // mS wait time.
-    const char ESC=27; // Define escape character for escape sequence.
-    while(true) { // Main forever loop.
-        printf("%c[2J%c[H", ESC, ESC); // ANSI/VT100 clear screen/home.
-        printf("In function demo main...\n");        
-        int a = 5; // Create and initialize a.
-        printf("a = %d\n", a); // Display a.
-        int b = 6; // Create and initialize b.
-        printf("b = %d\n", b); // Display b.
-        printf("About to call my function.\n");
-        int c = myFunc(a, b); // Call my function.
-        printf("Function has returned.\n");
-        printf("c = %d\n", c); // Display b.
+    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;
+
+    while(true) {  // Main forever loop.
         ThisThread::sleep_for(DELAY); // Pause
     }
-}
-
-int myFunc(int x, int y) { // Function definition. Often in separate files!
-    int z = (x + y)/myFactor;
-    return z; // Explicit return is required in C/C++. 
 }
\ No newline at end of file