Round of double value to 3 decimal places

Question

double s = 0.320166

I want to round off this value to exactly 3 decimal places. To do this, I am using this code

int v = s * 1000;
s = double(v)/1000;

When I display s, I am getting this result 0.32. It is not displaying the 0 at the end. I want to display 0.320 exactly 3 decimal places. I know the result is right, but is there anyway that 0 at the end can also display?

trailing zeroes are a string formatting issue, NOT a math issue. if you want leading/trailing zero-padding, you have to make that happen via the appropriate string formatting functions. — Marc B, Sep 08 '16 at 21:56
@Barmar i was thinking the same and yet it still doesn't display it^^ — deW1, Sep 08 '16 at 22:03

score 1 · Answer 1 · answered Sep 08 '16 at 22:05

1

char buf[32];
sprintf(buf, "%.3f", s);

answered Sep 08 '16 at 22:05

Dan Korn

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This is C code. The question is tagged C++. – Kevin Sep 08 '16 at 22:08
It's perfectly valid C++ code. It will work in any C++ function. – Dan Korn Sep 08 '16 at 22:10
Then use the C++ version: `std::sprintf`. – Kevin Sep 08 '16 at 22:10
thanks a lot, it worked perfectly as my requirement – Muhammad Umer Sep 08 '16 at 22:10
If my answer worked, please mark it as accepted. Thanks! – Dan Korn Sep 08 '16 at 22:12
Or at least up-vote! – Dan Korn Sep 08 '16 at 22:43

Round of double value to 3 decimal places

1 Answers1