Eduard Sjoukes
Use the format specifiers with floatingpoint numbers
Revision 0:727af1f2cbe4, committed 2010-12-21
- Comitter:
- Eduard
- Date:
- Tue Dec 21 16:55:20 2010 +0000
- Commit message:
Changed in this revision
--- /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
--- /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
--- /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