Diff: main.cpp

Revision:

113:cc5beacdad5a

Parent:

112:c7c727d92f2a

--- a/main.cpp	Mon Oct 11 12:24:03 2021 +0000
+++ b/main.cpp	Mon Oct 11 12:45:46 2021 +0000
@@ -1,52 +1,41 @@
 /*
-Project: 21_FuncEx_v5
+Project: 21_GlobalEx_v5
 File: main.cpp
 
  This simple program demonstrates that C passes arguments by value.
  
- See http://www.csie.ntu.edu.tw/~r92094/c++/VT100.html and/or 
- https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797 for escape 
- sequences.
+ 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. 1.2)
+ Written by: Dr. C. S. Tritt; Last revised 10/11/21 (v. 1.1)
 */
 #include "mbed.h"
 
-// Function definitions are typically in .h files are more commonly that are 
-// included here.
 int myFunc(int x, int y); // Function declaration required.
 
-Serial pc(USBTX, USBRX, 9600); // Create Serial object.
-
-const char ESC = 27; // ESC character for ANSI escape sequences.
-const int DELAY = 2000; // Loop delay in mS.
+// Arbitrary factor. Unitless. Move into main to break project.
+const float myFactor = 3.3f; // Suffix f indicates float (default is double).
 
 int main() {
-    while(true) {
-        // Clear screen & move cursor to upper left ANSI/VT100 sequence.
-        pc.printf("%c[2J", ESC); pc.printf("%c[H", ESC);
-        // Start of display code.
-        pc.printf("In function demo main...\n");        
+    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.
-        pc.printf("a = %d\n", a); // Display a.
+        printf("a = %d\n", a); // Display a.
         int b = 6; // Create and initialize b.
-        pc.printf("b = %d\n", b); // Display b.
-        pc.printf("About to call my function.\n");
+        printf("b = %d\n", b); // Display b.
+        printf("About to call my function.\n");
         int c = myFunc(a, b); // Call my function.
-        pc.printf("Function has returned.\n");
-        pc.printf("a = %d\n", a); // Redisplay a.
-        pc.printf("b = %d\n", b); // Redisplay b.               
-        pc.printf("c = %d\n", c); // Display b.
-        ThisThread::sleep_for(DELAY); // Pause for DELAY mS.
+        printf("Function has returned.\n");
+        printf("c = %d\n", c); // Display b.
+        ThisThread::sleep_for(DELAY); // Pause
     }
 }
 
 int myFunc(int x, int y) { // Function definition. Often in separate files!
-    int z = x + y;
-    // Changing parameter values here won't change argument values in main!
-    x = 50;
-    pc.printf("x = %d\n", x); // Generally don't put I/O in regular functions.
-    y = 100;
-    pc.printf("y = %d\n", y); // Generally don't put I/O in regular functions.
+    int z = (x + y)/myFactor;
     return z; // Explicit return is required in C/C++. 
-}    
\ No newline at end of file
+}
\ No newline at end of file