Write a program that allows the user to enter a start time and a future time. include a function named compute difference that takes the six variables as parameters that represent the start time and future time. your function should return, as an int, the time difference in minutes. for example, given a start time of 11: 59 am and a future time of 12: 01 pm, your program should compute 2 minutes as the time difference. given a start time of 11: 59 am and a future time of 11: 58 am, your program should compute 1439 minutes as the time difference (23 hours and 59 minutes). you may need "am" or "pm" from the user’s input by reading in two character values. (display 2.3 illustrates character input.) characters can be compared just like numbers. for example, if the variable a char is of type char, then (a_char == 'a')is a boolean expression that evaluates to true if a_char contains the letter a.