Please use #include only please. Thank you very much!

Write a program to ask the user to input the number of items sold and the cost of one item and then use a function to calculate the value of a purchase. The call to the function in main should pass the number of items purchased and the cost of an item. The function should return the value of the purchase. main should then display the value. The call in main would be: value = calculateValue(items, cost): A typical run would be: Enter number of items and cost: 52.50 The extended amount is exist12.50 Do you have another purchase to enter? Y or N N Thank you