Sorry i left this thread becuase i solve this problem.

first i always run my code on my 8052 system with LCD so the function WriteCommandLCD() is working absolutely fine.


second i replace
if( ((y % 4) == 0) && ((y % 100) != 0) || ((y % 400) == 0) )

with this code.

if( (DivAndRem(y, 4, 2) == 0) , .....

as you can see i replace (y % 4) with my own function DivAndRem(y, 4, 2) which basically calculates the remainder with subtraction. (last parameter 2 basically indicate that i need Remainder not Muliply of two numbers). NOW The Statement above is working absolutely fine in Debugger as well as on my real 8052 system after burning and running program. No Doubt about it.

I start new thread because i am stuck with another problem
this time with passing parameters to function. like

DivAndRem(long a, long b, int c)

and if i call the above function with this statement

int a, b;
a = 100;
b = 10;

DivAndRem(a, b ,2)

this hangs the system again as you can see the parameter types are different.

then just for testing i make all variables and parameters integer

and this work fine after i burn the program.

also some how if i use long it still hangs the system. but if i replace with int or double. every thing works fine

i am really confused and frustrated with all this debugging.

Shahzad