Dear Santhosh,
This is a c90 error. You have to follow the instructions below to solve this problem.
1. Open Quincy IDE and goto Tools->Options menu in the menu bar.
2. On the options menu, Build tab->Compilation behavior group. Here you have to check the "C99 Support for C Program"
Do you need reference image for this error. Please email your request to support@collectiva.in. Our support team will help you.
Hope this helps.
Thanks.