Java, how to make a convenient percentage output from a float

Question

I have the following code:

float fl = ((float)20701682/(float)20991474); 

And that gives me fl = 0.9861948 .

I would like to convert 0.9861948 to 2% since 2% was loaded.
I upload a file and count the progress.

Any help would be resolved.

Answer 1

I suppose you mean something like

 int percentage = (1 - fl) * 100; 

to calculate the percentage.

But for fl = 0.9861948 this gives 1 ( 1.38052 casted to int).

If you want 2 instead, you can use Math.ceil :

 int percentage = (int) Math.ceil((1 - fl) * 100); // gives 2 

Answer 2

you have constant values ​​in the code, you should replace them with variables representing the loaded amount and total size:

  float downloaded = 50; float total = 200; float percent = (100 * downloaded) / total; System.out.println(String.format("%.0f%%",percent)); 

Yield: 25%

Answer 3

I wrote two methods below to convert a floating point number to a string displayed as a percentage:

 //without decimal digits public static String toPercentage(float n){ return String.format("%.0f",n*100)+"%"; } //accept a param to determine the numbers of decimal digits public static String toPercentage(float n, int digits){ return String.format("%."+digits+"f",n*100)+"%"; } 

Test Case1:

 public static void main(String[] args) { float f = 1-0.9861948f;//your number,0.013805211 System.out.println("f="+f);//f=0.013805211 System.out.println(toPercentage(f));//1% System.out.println(toPercentage(f,2));//1.38% } 

Test Case2:

If you want 2% instead, try entering this parameter:

  float f = 1-0.9861948f;//your number,0.013805211 f= (float)(Math.ceil(f*100)/100);//f=0.02 System.out.println("f="+f);f=0.02 System.out.println(toPercentage(f));//2% System.out.println(toPercentage(f,2));//2.00% 

Answer 4

When you print a float, just say the string conversion just to prevent any / all / trailing digits:

System.out.printf("We have downloaded: %.0f %%%n", (1-fl) * 100);

But I'm not sure why you would like to round from 1.4% to 2%. If you really want this to be much more complicated, because there really was no good reason.

Answer 5

How about (1.0 -fl) * 100?

Convert this to an integer and you won't have a problem.

Answer 6

Since the percentage means “per 100”, perhaps you could have a few fl per 100. Since for some reason you want 0.98 to mean 2%, then you subtract the result from 100.

Answer 7

You need something like:

 float allSize = ...; float downloaded = ...; int percent = (allSize - downloaded/100 * 100.0)/allSize (downloaded/100 * 100.0) - used for make two digit of fractional part; 

Answer 8

After applying the logic ((1-fl) * 100) you can use DecimalFormat or String.format () .

Answer 9

 float fl = ((float)20701682 / (float)20991474)*100; int pct = 100 - Math.floor(fl)