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Somebody Tell me How to program A Atmel Microcontroller 8052 with C Language?

Somebody Tell me How to program A Atmel Microcontroller 8052 with C++   Language? I want to design a Circuit with this that relays operate by PC

There are no C++ compilers for the 8052, but there is a free C compiler called "SDCC". Make sure you get an Atmel variant that can be programmed over a standard serial connection, like the NXP P89C51RD2.

For something as simple as relay switching, what you want can be written in a few lines of assembler.

Steve