Write a program to compute the average of all the numbers stored in a text file. Assume the numbers are integers representing test scores, for example: XXXXXXXXXX XXXXXXXXXX 87 98 First use the...

Write a program to compute the average of all the numbers stored in a text file. Assume the numbers are integers representing test scores, for example:

70 85 90

92 57 100 88

87 98

First use the extraction operator, >>. Then use a WordStreamIterator object. Since WordStreamIterator::Current returns a string, you’ll need to convert the string to the corresponding integer; that is, the string "123" should be converted to the int 123. The function atoi in "strutils.h" in Howto G will convert the string.

int atoi(string s)

// pre: s represents an int, that is "123", "-457", etc.

// post: returns int equivalent of s

// if s isn’t properly formatted (that is "12a3")

// then 0 (zero) is returned