[Solved] statement even working and executing fine without the semicolon

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Your second code (after removing the syntax error caused by the comment) reads

a = b-- - printf("a = %d, b = %d", a, b);

Since printf returns a value, that is valid code. When I initialise

int a = 0;

the program output is 

a = 0, b = 120

In C end-of-line does not mean end-of-statement.

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solved statement even working and executing fine without the semicolon