I need help in C, Can someone help me understand step by step? Thanks

Note: Integer division discards the fraction. Hence the average of 81054 is output as 6 , not 6.75. Note: The test cases include four very large input values whose product results in overflow. You do not need to do anything special, but just observe that the output does not represent the correct product (in fact, four positive numbers yield a negative output; wow). Submit the above for grading. Your program will fail the last test cases (which is expected), until you complete part 2 below