To evaluate the expression 7/9 * 9 in C and C++, we need to consider the data types involved.
By default, when dividing two integers in C and C++, the result will be an integer, which means the decimal part will be truncated.
Let's evaluate the expression step by step:
7/9 = 0 (since both 7 and 9 are integers, the result will be an integer and the decimal part is truncated)
0 * 9 = 0 (0 multiplied by any number is 0)
Therefore, the result of the expression 7/9 * 9 in C and C++ is 0.
Hence, the correct answer is option C.