Prepending single digits with zero.

Programming Questions

Derek J. ..

Prepending single digits with zero.

in Programming Questions • 7 months ago

I have no idea how to do this. What I'm doing is constructing a float value based on the time of day in this format: HH.MMSS.

That bit I've worked out. However second(), minute(), and hour(), will return single digits for 0–9. I would like to change that to 00–09.

I've been trying to get java.text.DecimalFormat() to do the trick and it works in some instances but when I combine everything into one float it just drops all the zeros. Here's my example code.

import java.text.DecimalFormat;
DecimalFormat df = new java.text.DecimalFormat("00");
void draw() {
background(204);
float s = second();
float m = minute();
float h = hour();
float f = float(df.format(h) + "." + df.format(m) + df.format(s));
// println(df.format(h)); // WORKS
// println(df.format(m)); // WORKS
// println(df.format(s)); // WORKS
println(df.format(f)); // DOES NOT WORK
}

Any advice would be fantastic. Thanks all!

Cheers,

Derek.

—
Derek J. Kinsman, creative technologist.
@ghostpressbed

Replies(5)

tfguy44

Re: Prepending single digits with zero.

7 months ago

nf()

Derek J. ..

Re: Prepending single digits with zero.

7 months ago

Corrected the code.

import java.text.DecimalFormat;
DecimalFormat df = new java.text.DecimalFormat("00");
void draw() {
background(204);
float s = second();
float m = minute();
float h = hour();
String f = df.format(h) + "." + df.format(m) + df.format(s);
float deltaF = float(f);
// println(df.format(h)); // WORKS
// println(df.format(m)); // WORKS
// println(df.format(s)); // WORKS
// println(f); // WORKS
println(deltaF); // DOES NOT WORK
}

—
Derek J. Kinsman, creative technologist.
@ghostpressbed

GoToLoop

Re: Prepending single digits with zero.

7 months ago

What about this one?:
P.S.: Oops. I was too l8!

import java.text.DecimalFormat;

DecimalFormat df = new java.text.DecimalFormat("00");

void draw() {
  float s = second();
  float m = minute();
  float h = hour();

  String f = df.format(h) + ":" + df.format(m) + ":" + df.format(s);
  println(f);
}

tfguy44

Re: Prepending single digits with zero.

7 months ago

When you tell println() to print a float, it is NEVER going to print trailing 0's.

What you can do is take that float and format it nicely so that you get a string with trailing 0's.

When you tell printf() to print that String, it WILL print the trailing 0's.

void draw() {
background(204);
int s = second();
int m = minute();
int h = hour();
String f = nf(h, 2) + "." + nf(m, 2) + nf(s, 2);
float deltaF = float(f);
println(nf(h, 2));
println(nf(m, 2));
println(nf(s, 2));
println(f);
println(nf(deltaF, 2, 4));
}

Derek J. ..

Re: Prepending single digits with zero.

7 months ago

Awesome! Thanks for the assist guys!

nf() worked perfectly. ^_^

—
Derek J. Kinsman, creative technologist.
@ghostpressbed

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