Thanks a lot for your help.
I tried in following way, it works fine now.

cmm ="./pvengine /render  dam.pov  -d /exit";

But now my problem is I should run my program from diffrent location, so set
directory path as follows (I use cygwin to compile & run program)

cmm ="POV-Ray\ for\ Windows\ v3.6/bin/./pvengine  /render  dam.pov   -d
/exit";

Now the problem is it just run POV-ray without rendering the file. I mean it
just appear POV window, just run something for a while and close the window.
I dont understand why it does so. Please help me.

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