c++ - I cant find the 20% of the total of multiple numbers

Question

    This line is the problem please help me :<

    cout<<"20% VAT:"<<(order_of_fries*pricef)+(order_of_burgers*priceb)+(order_of_donuts*priced)+(order_of_ice_cream*pricei)+(order_of_soft_drinks*prices)*0.20<<endl;
    
    pls help me get 20% :<<<

it doesn't work with 0.20 what else can I try?

question from:https://stackoverflow.com/questions/65904788/i-cant-find-the-20-of-the-total-of-multiple-numbers

Answer 1

In c++ we have the same rule as in the real world, that multiplication is resolved before addition. So you have to put the result of the sum in brackets:

cout<<"20% VAT:"<<((order_of_fries*pricef)
                  +(order_of_burgers*priceb)
                  +(order_of_donuts*priced)
                  +(order_of_ice_cream*pricei)
                  +(order_of_soft_drinks*prices))*0.20<<endl;