how to display 2 decimal point in a double

Question

I want to show a 2 decimal point for the Average in the console.WritLine. Right now it showing a whole number.

string input = "";
int total=0 ;
int numbersEntered =0 ;
double average=0.00 ;

total += Convert.ToInt32(input);
numbersEntered++;
average = (total / numbersEntered);
Console.WriteLine("Total: {0}\t Numbers Entered: {1}\t Average: {2:#.##}\t", total, numbersEntered, average);
Console.ReadKey();

You might want to read some documentation first: http://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx — Ian Stevens, Feb 26 '14 at 21:07

score 2 · Answer 1 · answered Feb 26 '14 at 21:06

declare total and numbersEntered double as well. you are using int, then dividing integer with integer will return whole number not a double with 2 decimal point.

string input = "";
double total=0 ;
double numbersEntered =0 ;
double average=0.00 ;

total += Convert.ToInt32(input);
numbersEntered++;
average = (total / numbersEntered);
Console.WriteLine("Total: {0}\t Numbers Entered: {1}\t Average: {2:#.##}\t", total,    numbersEntered, average);
Console.ReadKey();

score 1 · Answer 2 · answered Feb 26 '14 at 21:06

I think this is C#? You probably want to add the tag to get better answers. If it is, try replacing your Console.WriteLine with this:

 Console.WriteLine("Total: {0}\t Numbers Entered: {1}\t Average: {2:F2}\t",
                   total, numbersEntered, average);

The documentation I found for this was here and here.

score 0 · Answer 3 · answered Feb 26 '14 at 21:11

Change

average = (total / numbersEntered);

to

average = ((double)total / numbersEntered);

The operator / between two integers does integer division. Only after the division is performed is the result (quotient) converted from int to double, but by then precision has already been lost.

I converted one of the operands (the left one) from int to double; the right operand will then automatcally be converted as well (the conversion from int to double is implicit). When the operands of the / operator are doubles, floating-point division is performed which is what you want.

how to display 2 decimal point in a double

3 Answers3