Use the format specifiers with floatingpoint numbers

Files at this revision

API Documentation at this revision

Comitter:
Eduard
Date:
Tue Dec 21 16:55:20 2010 +0000
Commit message:

Changed in this revision

OptrexLCD.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
diff -r 000000000000 -r 727af1f2cbe4 OptrexLCD.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OptrexLCD.lib	Tue Dec 21 16:55:20 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/Eduard/code/OptrexLCD/#ef7b6dec773f
diff -r 000000000000 -r 727af1f2cbe4 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Dec 21 16:55:20 2010 +0000
@@ -0,0 +1,80 @@
+/*************************************************************************
+* Test of "format specifiers" and display those on a 20x4 Optrex LCD
+* This LCD needs a different timing than a normal LCD, see the 
+* OptrexLCD program for more information.
+* Probally this program will work also with a "normal" 20x4 LCD
+* if not replace the OptrexLCD library with the original TextLCD library.  
+**************************************************************************
+*/
+#include "mbed.h"
+#include "OptrexLCD.h"
+
+DigitalOut BlinkLed(LED4);
+
+TextLCD lcd(p10, p12, p15, p16, p17, p18, TextLCD::LCD20x4 ); // rs, e, d0-d3  
+
+void WaitRefres(int a) // procedure for showing the result for  'a' seconds before getting the next datatypes 
+{
+    wait(a);
+    lcd.cls();
+    BlinkLed = !BlinkLed;
+} 
+    
+int main() 
+{
+    lcd.cls();
+    BlinkLed = 1;   // show the program is running
+    while(1)
+    {
+        lcd.printf("     The use of\n");
+        lcd.printf("    Floatingpoint\n");
+        lcd.printf("  Format Specifiers\n");
+        lcd.printf("     @e.sjoukes");
+        WaitRefres(3);
+        
+        float f = 0;
+        lcd.printf("Default notations 1\n"); 
+        lcd.printf("for f= 0 \n");
+        lcd.printf("   %%f= %f\n",f);           //float notation takes 6 nummers after the point in this case 6 zero's.
+        WaitRefres(5);
+        
+        f = 12.345678;
+        lcd.printf("Default notations 2\n");
+        lcd.printf("for f= 12.345678\n");
+        lcd.printf("   %%f= %f\n",f);
+        WaitRefres(5);
+        
+        f = 12345.678;
+        lcd.printf("BUT \n");
+        lcd.printf("for f= 12345.678\n");
+        lcd.printf("   %%f= %f\n",f);           //again notation takes 6 nummers after the point but now there is a fault
+        lcd.printf("the fault= 0.000266");
+        WaitRefres(7.5);
+        
+        f =1234.12345;
+        lcd.printf("for   f= 1234.12345\n");
+        lcd.printf("  %%9.2f= %9.2f\n", f);        
+        lcd.printf(" %%09.2f= %09.2f\n", f);
+        lcd.printf("%%+09.2f= %+09.2f", f);
+        WaitRefres(7.5);
+
+        
+        lcd.printf("A very big number\n");
+        float f1 = 10000000000000000000;
+        float f2 = 10000000000000000000;
+        f1 = f1*f2;                                 //seems that it's not possible to write 100,000,000,000,000,000,000,000,000,000,000,000,000  
+        lcd.printf("for f= 1e38 %%f= \n%38.0f",f1); //at once to the program.
+        WaitRefres(5);
+        
+        lcd.printf("A too big number\n");
+        lcd.printf("%%f= %f\n",f1*10);
+        lcd.printf("Uppercast with %%F\n");
+        lcd.printf("%%F= %F\n",f1*10); 
+        WaitRefres(5);
+        
+        lcd.printf("A very small number\n");
+        f = 0.0000000000000000000000000000000000001;
+        lcd.printf("for f= 1e-38 %%f= \n%39.37f\n", f);
+        WaitRefres(5);
+   } 
+}
\ No newline at end of file
diff -r 000000000000 -r 727af1f2cbe4 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Dec 21 16:55:20 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e