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Authors:
Walter Savitch ,julia Lobur
Chapter:
Functions For All Subtasks
Exercise:
Self-test Exercises
Question:11 | ISBN:9780321531346 | Edition: 7

Question

Write a void function definition for a function called add_tax. The function

add_tax has two formal parameters: tax_rate, which is the amount

of sales tax expressed as a percentage, and cost, which is the cost of an

item before tax. The function changes the value of cost so that it includes

sales tax.

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Answer

void add_tax(double tax_rate, double& cost)

{

cost = cost + ( tax_rate/100.0 )*cost;

}


The division by 100 is to convert a percent to a fraction. For example, 10% is 10/100.0 or 1/10th of the cost.

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