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Why does alert(0.-5) print -5?

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7

1

Suppose I write 0.5 as 0.-5 in unexpected way, but it can still run, my question is , what does "0." in "0.-5" do so that it can still run and prints -5?

I also tried alert(0.-5+1) , which prints -4, does javascript ignores "0." in "0.-5"?

javascript numbers

share|improve this question

edited 59 mins ago

Charlie H

9,03342550

asked 2 hours ago

mmmaaammmaaa

2,2281311

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  0. is like 0.0. Or just 0.
  
  – Ry-♦
  2 hours ago
  
  
  

  
  
  
  

add a comment | 

7

1

Suppose I write 0.5 as 0.-5 in unexpected way, but it can still run, my question is , what does "0." in "0.-5" do so that it can still run and prints -5?

I also tried alert(0.-5+1) , which prints -4, does javascript ignores "0." in "0.-5"?

javascript numbers

share|improve this question

edited 59 mins ago

Charlie H

9,03342550

asked 2 hours ago

mmmaaammmaaa

2,2281311

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  0. is like 0.0. Or just 0.
  
  – Ry-♦
  2 hours ago
  
  
  

  
  
  
  

add a comment | 

Suppose I write 0.5 as 0.-5 in unexpected way, but it can still run, my question is , what does "0." in "0.-5" do so that it can still run and prints -5?

I also tried alert(0.-5+1) , which prints -4, does javascript ignores "0." in "0.-5"?

javascript numbers

share|improve this question

edited 59 mins ago

Charlie H

9,03342550

asked 2 hours ago

mmmaaammmaaa

2,2281311

share|improve this question

edited 59 mins ago

Charlie H

9,03342550

asked 2 hours ago

mmmaaammmaaa

2,2281311

share|improve this question

edited 59 mins ago

Charlie H

9,03342550

asked 2 hours ago

mmmaaammmaaa

2,2281311

edited 59 mins ago

Charlie H

9,03342550

edited 59 mins ago

Charlie H

9,03342550

asked 2 hours ago

mmmaaammmaaa

2,2281311

asked 2 hours ago

mmmaaammmaaa

2,2281311

2 Answers
2

active

oldest

votes

7

Trailing digits after a . are optional:

console.log(0. === 0);

So

0.-5

evalutes to

0 - 5

which is just -5. Similarly,

0.-5+1

is

0 - 5 + 1

which is

-5 + 1

or -4.

share|improve this answer

answered 2 hours ago

CertainPerformanceCertainPerformance

88.8k154876

add a comment | 

0

In JS you can express a number with optional decimal point.

x = 5.;    //5

x = 5. + 6.   //11

share|improve this answer

answered 1 hour ago

Charlie HCharlie H

9,03342550

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can even do 5..toString().
  
  – Tvde1
  21 mins ago
  

  
  
  
  

add a comment | 

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7

Trailing digits after a . are optional:

console.log(0. === 0);

So

0.-5

evalutes to

0 - 5

which is just -5. Similarly,

0.-5+1

is

0 - 5 + 1

which is

-5 + 1

or -4.

share|improve this answer

answered 2 hours ago

CertainPerformanceCertainPerformance

88.8k154876

add a comment | 

7

Trailing digits after a . are optional:

console.log(0. === 0);

So

0.-5

evalutes to

0 - 5

which is just -5. Similarly,

0.-5+1

is

0 - 5 + 1

which is

-5 + 1

or -4.

share|improve this answer

answered 2 hours ago

CertainPerformanceCertainPerformance

88.8k154876

add a comment | 

Trailing digits after a . are optional:

console.log(0. === 0);

So

0.-5

evalutes to

0 - 5

which is just -5. Similarly,

0.-5+1

is

0 - 5 + 1

which is

-5 + 1

or -4.

share|improve this answer

answered 2 hours ago

CertainPerformanceCertainPerformance

88.8k154876

console.log(0. === 0);

0.-5

0 - 5

0.-5+1

0 - 5 + 1

-5 + 1

console.log(0. === 0);

console.log(0. === 0);

share|improve this answer

answered 2 hours ago

CertainPerformanceCertainPerformance

88.8k154876

answered 2 hours ago

CertainPerformanceCertainPerformance

88.8k154876

answered 2 hours ago

CertainPerformanceCertainPerformance

88.8k154876

0

In JS you can express a number with optional decimal point.

x = 5.;    //5

x = 5. + 6.   //11

share|improve this answer

answered 1 hour ago

Charlie HCharlie H

9,03342550

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can even do 5..toString().
  
  – Tvde1
  21 mins ago
  

  
  
  
  

add a comment | 

0

In JS you can express a number with optional decimal point.

x = 5.;    //5

x = 5. + 6.   //11

share|improve this answer

answered 1 hour ago

Charlie HCharlie H

9,03342550

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can even do 5..toString().
  
  – Tvde1
  21 mins ago
  

  
  
  
  

add a comment | 

In JS you can express a number with optional decimal point.

x = 5.;    //5

x = 5. + 6.   //11

share|improve this answer

answered 1 hour ago

Charlie HCharlie H

9,03342550

x = 5.;    //5

x = 5. + 6.   //11

share|improve this answer

answered 1 hour ago

Charlie HCharlie H

9,03342550

answered 1 hour ago

Charlie HCharlie H

9,03342550

answered 1 hour ago

Charlie HCharlie H

9,03342550