Write a C$++$ program using FUNCTIONS to input $4$ test scores and output the average of the $4.$

In main $(),$ declare $4$ variables for $4$ scores.$$ You MUST name them$$ XXscore$1,$ XXscore$2....$where XX is your $2$ initials.$$ Mine would SKscore$1..$

Function $1$: Get $4$ scores as inputs from user. Return the$4$ scores to main$().$ Validate that none are negative. Return a boolean indicating whether data is good or bad.

Function $2$: If the scores are all valid, calculate the average.$$ Return value as double to main.

In main, output the average.

Extra credit: Drop the lowest user input and output the average of $3$ temps.

SAMPLE:

Enter four scores $($no negatives$)$:$80908090$

Average of four is $85$

Enter four scores $($no negatives$)$: $7080-6090$

Bad Data: one of the scores is negative

Enter four scores $($no negatives$)$: $80908090$

Average of three best scores is $86\mathrm{.}6667($extra credit, lowest dropped$)$