added chapters 29, 30 and 31

0x001d_static-conditionals/main.c

@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "pico/cyw43_arch.h"
+
+#define FAV_NUM 42
+
+int main(void)
+{
+    stdio_init_all();
+
+    int choice = 1;
+
+    while (true)
+    {
+        if (choice == 1) {
+            printf("1\r\n");
+        } else if (choice == 2) {
+            printf("2\r\n");
+        } else {
+            printf("?\r\n");
+        }
+
+        switch (choice) {
+            case 1:
+                printf("one\r\n");
+                break;
+            case 2:
+                printf("two\r\n");
+                break;   
+            default:
+                printf("??\r\n");  
+        }
+    }
+}