[arm-gnu] an long long problem

[zzzh.2007]

Hi, all,

I am using sourcery_g++_lite_for_arm_eabi ( version of arm-2008q3-66-arm-none-eabi) in Contiki to do some programming, and below is my code that have problem:

-----------------------------------------------
short a,x;
long long y;

a = (short)rand();
x = (short)rand() *10000/66536;

y = a*x*x;

printf( "a and x are %d, %d \n", a, x);
printf( " y is: %lld \n", y);

----------------------------------------------
The problem is: the y result is always wrong.

I have no idea why this is happening, any help?




Zhu
2012-03-22
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