Diff: shell.cpp

Revision:

14:73ef945b8def

Parent:

13:019e24491f32

Child:

15:a32db434af65

--- a/shell.cpp	Fri Apr 18 21:33:57 2014 +0000
+++ b/shell.cpp	Thu Apr 24 23:27:17 2014 +0000
@@ -158,6 +158,7 @@
     if(findString("Ralph")) sendText(" -- Hey, that's me!");
 
     if(findString("turn")) parseLEDState();
+    if(findString("generate")) parseGenerate();
 }
 //-----------------------------------------------------------------------------
 
@@ -224,6 +225,13 @@
 }
 //-----------------------------------------------------------------------------
 
+void Shell::parseGenerate()
+{
+    if(findString("pi")) generatePi();
+    else sendText(" -- generate what?");
+}
+//-----------------------------------------------------------------------------
+
 void Shell::reportPushButtonPress(ePushButton thisPushButton)
 {
     switch(thisPushButton) {
@@ -232,4 +240,54 @@
     }
     sendText(" pressed\n> ");
 }
-//-----------------------------------------------------------------------------
\ No newline at end of file
+//-----------------------------------------------------------------------------
+
+#define  n    1000//1125
+#define  len  10*n/3
+
+void Shell::generatePi()
+{
+    int  i, j, k, q, x, nines, predigit, digits;
+    int  a[len];
+
+    sendText(" -- Pi = ");
+
+    digits=0;
+    for (j=1; j<=len; j++)
+        a[j] = 2;
+    nines = 0;
+    predigit = 0;//               {First predigit is a 0}
+    for (j=1; j<=n; j++) {
+        q = 0;
+        for(i=len; i>0; i--) {
+            x    = 10*a[i] + q*i;
+            a[i] = x % (2*i - 1);
+            q    = x / (2*i - 1);
+
+        }
+        a[1] = q % 10;
+        q = q / 10;
+        if (q == 9) {
+            nines++;
+        } else {
+            if (q == 10) {
+                usbSerial->printf("%d",predigit+1);
+                for (k=1; k<=nines; k++) // to nines do
+                    usbSerial->printf("0");//            {zeros}
+                predigit = 0;
+                nines = 0;
+            } else {
+                usbSerial->printf("%d",predigit);
+                predigit = q;
+                if (nines != 0) { // then
+                    for(k=1; k<=nines; k++) // do
+                        usbSerial->printf("9");
+                    nines = 0;
+                }
+            }
+            digits++;
+            digits+=nines;
+        }
+    }
+}
+//-----------------------------------------------------------------------------