Introduction - If you have any usage issues, please Google them yourself
N student achievement has been the main function into a linked list structure to take the lead node, h point to the head of the list node. Please write the function fun, it' s function is to: find the average, the value returned by the function. For example, if student achievement is: 85,76,69,85,91,72,64,87, the average should be: 78.625. Note: Some source code in the file PROG1.C. Do not change main function and other functions in any content, only the braces in the function fun fill a number of statements you write.