i often get linker error
"undefined symbol _main in the module c0.asm"
when running the c files .. how can overcome this error

Well i used to get linker errors often , when the paths weren't set.
Check ur directory ( in ur turbo c++ go to options and directories ,check whether u have given paths in include directories and the rest in it ).

I still get such linker error.....all the header files get these errors....

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