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You don't need an if statement. Just follow the pseudocode posted above.

Forget the if statement, forget the array. Just multiply by 100.

loop if input is not 0
get user input
multiply by 100
add to sum
}
display sum

Use an if statement on the user input to decide what value to add. Then again if service 1 costs 100, service 2 costs 200 etc then you could just multiply input by 100 and then add it.

To avoid an empty array element.

How about an if statement?

And???

Do you have a question? Do have errors? Do you want a pat on the back. Or do you just want someone to do your work for you?