Please check this KBA:
Make sure that the heap size required to support sprintf and sscanf is set in your project (.cydwr > System > Heap Size). The default value is 0x80, which will not be enough to support these functions. You can change it to a higher value such as 0x1000.
thank you so much
but what is the .cydwr? , Where can i find it?
Oh! Thank you so much man
I'm thankfull to you it is worked So i made my project %30 because of you <3