java vs C++ in pre and post increment

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The results are different because the lauguages are specified differently.

why java says 50

Because the order of evaluation is defined so in Java. The addition is: 6+7+8+9+10+10 == 50. The final post increment is overwritten by the assignment and has no effect.

while c++ says 51

The shown program has undefined behaviour in C++, so it could have any output. It happened to be 51 in this case. More details in this answer: https://stackoverflow.com/a/4176333/2079303

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