❔ Why is this var not working?

S

Samarichitane•11/22/22, 6:27 PM

Is cPop a float too ?

A

Akseli•11/22/22, 6:27 PM

float popMult = cPop / 1000000f;

float popMult = cPop / 1000000f;

float popMult = cPop / 1000000f;

float popMult = cPop / 1000000f;

M

MODiX•11/22/22, 6:31 PM

Toshiya Joshima#3472

REPL Result: Success

const float limit = 1E6f;

        var cPop = Random.Shared.Next((int)1E3, (int)1E7);

        var popMult = cPop / limit;

        if (cPop > limit)
        {
            popMult /= 10;
            popMult += 1;
        }

        Console.WriteLine(cPop);
        Console.WriteLine(popMult);

const float limit = 1E6f;

        var cPop = Random.Shared.Next((int)1E3, (int)1E7);

        var popMult = cPop / limit;

        if (cPop > limit)
        {
            popMult /= 10;
            popMult += 1;
        }

        Console.WriteLine(cPop);
        Console.WriteLine(popMult);

const float limit = 1E6f;

        var cPop = Random.Shared.Next((int)1E3, (int)1E7);

        var popMult = cPop / limit;

        if (cPop > limit)
        {
            popMult /= 10;
            popMult += 1;
        }

        Console.WriteLine(cPop);
        Console.WriteLine(popMult);

const float limit = 1E6f;

        var cPop = Random.Shared.Next((int)1E3, (int)1E7);

        var popMult = cPop / limit;

        if (cPop > limit)
        {
            popMult /= 10;
            popMult += 1;
        }

        Console.WriteLine(cPop);
        Console.WriteLine(popMult);

Console Output

2913884
1.2913884

2913884
1.2913884

2913884
1.2913884

2913884
1.2913884

Compile: 536.469ms | Execution: 79.921ms | React with ❌ to remove this embed.

S

Samarichitane•11/22/22, 6:32 PM

Yeah i figured that out

M

MODiX•11/22/22, 6:33 PM

Toshiya Joshima#3472

REPL Result: Success

1f / 2d

1f / 2d

1f / 2d

1f / 2d

Result: double

0.5

0.5

0.5

0.5

Compile: 383.452ms | Execution: 21.987ms | React with ❌ to remove this embed.

A

Akseli•11/22/22, 6:33 PM

it should be possible

S

Samarichitane•11/22/22, 6:33 PM

Result is double

S

Samarichitane•11/22/22, 6:33 PM

its possible as you see

S

Samarichitane•11/22/22, 6:33 PM

double has a wider range/precision

S

Samarichitane•11/22/22, 6:33 PM

that's why

A

Akseli•11/22/22, 6:34 PM

thats just double

M

MODiX•11/22/22, 6:34 PM

Toshiya Joshima#3472

REPL Result: Success

1 / 3f

1 / 3f

1 / 3f

1 / 3f

Result: float

0.33333334

0.33333334

0.33333334

0.33333334

Compile: 360.098ms | Execution: 22.324ms | React with ❌ to remove this embed.

M

MODiX•11/22/22, 6:34 PM

Toshiya Joshima#3472

REPL Result: Success

1 / 3d

1 / 3d

1 / 3d

1 / 3d

Result: double

0.3333333333333333

0.3333333333333333

0.3333333333333333

0.3333333333333333

Compile: 355.080ms | Execution: 22.122ms | React with ❌ to remove this embed.

A

Akseli•11/22/22, 6:34 PM

float is just the alias, the real name is "Single" in c#

S

Samarichitane•11/22/22, 6:34 PM

Compiler just assumes it needs more precision

S

Samarichitane•11/22/22, 6:34 PM

thats why

A

Akseli•11/22/22, 6:35 PM

because double takes up more memory and is slower than float

S

Samarichitane•11/22/22, 6:35 PM

You can cast it after that

A

Akseli•11/22/22, 6:35 PM

so its not optimal to use double when its not needed

A

Akseli•11/22/22, 6:35 PM

thats why float exists

M

MODiX•11/22/22, 6:35 PM

Toshiya Joshima#3472

REPL Result: Success

(float)(1 / 3d)

(float)(1 / 3d)

(float)(1 / 3d)

(float)(1 / 3d)

Result: float

0.33333334

0.33333334

0.33333334

0.33333334

Compile: 396.649ms | Execution: 22.270ms | React with ❌ to remove this embed.

S

Samarichitane•11/22/22, 6:36 PM

You need to decide what type you prefer

S

Samarichitane•11/22/22, 6:36 PM

You can use suffixes like i did

S

Samarichitane•11/22/22, 6:36 PM

d for double, f for float

M

MODiX•11/22/22, 6:36 PM

Toshiya Joshima#3472

REPL Result: Success

(100d, 100f)

(100d, 100f)

(100d, 100f)

(100d, 100f)

Result: ValueTuple<double, float>

{
  "item1": 100,
  "item2": 100
}

{
  "item1": 100,
  "item2": 100
}

{
  "item1": 100,
  "item2": 100
}

{
  "item1": 100,
  "item2": 100
}

Compile: 317.370ms | Execution: 64.574ms | React with ❌ to remove this embed.

A

Akseli•11/22/22, 6:37 PM

there

A

Akseli•11/22/22, 6:37 PM

Half, Single, Double

A

Akseli•11/22/22, 6:37 PM

they all exist

A

Akseli•11/22/22, 6:37 PM

Half = 16 bit
Single = alias: float 32 bit
Double = alias: double 64 bit

Half = 16 bit
Single = alias: float 32 bit
Double = alias: double 64 bit

Half = 16 bit
Single = alias: float 32 bit
Double = alias: double 64 bit

Half = 16 bit
Single = alias: float 32 bit
Double = alias: double 64 bit

A

Akseli•11/22/22, 6:38 PM

Half is a 16 bit floating point number

M

MODiX•11/22/22, 6:38 PM

Toshiya Joshima#3472

REPL Result: Success

sizeof(short)

sizeof(short)

sizeof(short)

sizeof(short)

Result: int

Compile: 298.822ms | Execution: 22.176ms | React with ❌ to remove this embed.

M

MODiX•11/22/22, 6:38 PM

Toshiya Joshima#3472

REPL Result: Success

sizeof(double)

sizeof(double)

sizeof(double)

sizeof(double)

Result: int

Compile: 317.089ms | Execution: 31.802ms | React with ❌ to remove this embed.

M

MODiX•11/22/22, 6:38 PM

Toshiya Joshima#3472

REPL Result: Success

sizeof(long)

sizeof(long)

sizeof(long)

sizeof(long)

Result: int

Compile: 311.626ms | Execution: 20.589ms | React with ❌ to remove this embed.

S

Samarichitane•11/22/22, 6:39 PM

wdym by one naming ?

S

Samarichitane•11/22/22, 6:39 PM

1 type for types ?

S

Samarichitane•11/22/22, 6:39 PM

like number ?

S

Samarichitane•11/22/22, 6:40 PM

It'll drop performance that's why

A

Akseli•11/22/22, 6:40 PM

you can use the actual type names if you want to, its not recommended but:

Int16
Int32
Int64

Int16
Int32
Int64

Int16
Int32
Int64

Int16
Int32
Int64

all work

S

Samarichitane•11/22/22, 6:41 PM

Answer is simple: PERFORMANCE

M

MODiX•11/22/22, 6:41 PM

Akseli#8820

REPL Result: Failure

test

test

test

test

Exception: CompilationErrorException

- The name 'test' does not exist in the current context

- The name 'test' does not exist in the current context

- The name 'test' does not exist in the current context

- The name 'test' does not exist in the current context

Compile: 343.486ms | Execution: 0.000ms | React with ❌ to remove this embed.

M

MODiX•11/22/22, 6:41 PM

Akseli#8820

REPL Result: Success

Single a = 5; Single b = 10; Single c = a / b;

Single a = 5; Single b = 10; Single c = a / b;

Single a = 5; Single b = 10; Single c = a / b;

Single a = 5; Single b = 10; Single c = a / b;

Compile: 403.592ms | Execution: 29.094ms | React with ❌ to remove this embed.

S

Samarichitane•11/22/22, 6:41 PM

What's double by default ?

A

Akseli•11/22/22, 6:42 PM

that how it works in almost every programming language except javascript and python

S

Samarichitane•11/22/22, 6:42 PM

0.5 is a wider range of precision

S

Samarichitane•11/22/22, 6:42 PM

if you dont specify it compiler choses wider option

A

Akseli•11/22/22, 6:43 PM

python is not most used language

A

Akseli•11/22/22, 6:43 PM

do you know why its so slow?

A

Akseli•11/22/22, 6:43 PM

because they dont do this stuff like 0.5 is a double and 0.5f is a float

A

Akseli•11/22/22, 6:43 PM

thats one of the reasons why python is so slow

A

Akseli•11/22/22, 6:43 PM

they allow lenience like this

❔ Why is this var not working?

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