CODEWITHSUNDEEP
javatimeformatting
Michael_D
Michael_D

Reputation: 25

Formatting a double to minutes and seconds

I'm trying to let the user enter the length of a song except they can enter the length as 5.76 for example. Is there a way I can format that 6.16?

This is how they enter the duration if it makes any difference:

System.out.println("Please enter the length of the song");
double length = sc.nextDouble();

Upvotes: 0

Views: 3967

Answers (3)

Taylor Hx
Taylor Hx

Reputation: 2833

The code below will split the entered time into minutes and seconds, and then operate on the seconds entry to calculate the total number of minutes and seconds are represented by that number.

EDIT Modified the code so that trailing zeroes are not truncated.

System.out.println("Please enter the length of the song");
String length = sc.next("\\d+\\.\\d{2,}");

String[] split = ("" + length).split("\\.");

double minutes = Double.parseDouble(split[0]);
double seconds = (Double.parseDouble(split[1]));

seconds = (Math.floor(seconds / 60)) + ((seconds % 60) / 100);

System.out.println(minutes + seconds);

Upvotes: 1

Steven Hansen
Steven Hansen

Reputation: 3239

With the following code, you can convert to minutes and seconds, then output that however you want, including put it back into a double (as shown).

int minutes = Math.floor(length);

length -= minutes;
length = Math.floor(length * 100.0);
if (length > 59) {
   minutes++;
   length -= 60;
}

int seconds = Math.floor(length);

length = ((double) minutes) + ((double) seconds) / 100.0;

Upvotes: 0

Ari
Ari

Reputation: 2004

Get the decimal value and check if its greater than 0.6. You can then subtract it from 0.6 and add that difference and 1 to the floor of the orignal number. 

double dec = length  - Math.floor(length);
if(dec > 0.6){
    double diff = dec - 0.6;
    length = length + 1 - dec + diff;
}

However, this might cause a lot of decimals due to the way double is stored in Java. You could get around this, but you should really use a different value to store hours and minutes than a double. You could use an integer for each, and you could initially scan in the input as a String and then process it.

Upvotes: 0

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