Diff: main.cpp

Revision:

0:727af1f2cbe4

--- /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