Summation variables in java

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Summation variables in java

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#1 by (2 votes)
#2 by (0 votes)

0

I have a double variable declared inside a for loop, this variable returns different values according to the loop through the list array.

for(int i = 0; i < ticketAdapter.mTicket.mLines.size(); i++){
                double totalNoVATt = ticketAdapter.mTicket.mLines.get(i).mTotalNoVAT * ticketAdapter.mTicket.mLines.get(i).mUnits;
                Log.i("MainActivity","totalnovat "+ totalNoVATt);
            }

I wanted to know how to save the sum of these values in a variable that it returns to me.

Greetings.

java android android-studio

asked by J. Burrueco 05.12.2018 в 10:54

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2 answers

0

If you can use Java 8 (or higher), you may prefer:

double sumatorio = ticketAdapter.mTicket.mLines.stream().mapToDouble( m -> m.mTotalNoVAT * m.mUnits ).sum();

answered by 05.12.2018 в 16:00

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score 2 · Accepted Answer

Declare a variable of the same type (Double) outside the loop and you add the amount calculated in each iteration within the loop, something like this:

double sumatoria = 0.0;
for(int i = 0; i < ticketAdapter.mTicket.mLines.size(); i++){
    double totalNoVATt = ticketAdapter.mTicket.mLines.get(i).mTotalNoVAT * ticketAdapter.mTicket.mLines.get(i).mUnits;
    sumatoria += totalNoVATt;
    Log.i("MainActivity","totalnovat "+ totalNoVATt);
}
System.out.println(sumatoria);