# Ruby | BigDecimal E() function

BigDecimal#E() : E() is a BigDecimal class method which returns the value of arctangent to the specified number of digits of precision, numeric.

Syntax: BigDecimal.E()

Parameter: BigDecimal values

Return: the value of arctangent to the specified number of digits of precision, numeric.

Example #1 :

 `# Ruby code for BigDecimal.E() method ` ` `  `# loading library ` `require ``'bigdecimal'` `require ``'bigdecimal/util'` ` `  `require ``"bigdecimal/math"` ` `  `include BigMath ` ` `  `# declaring bigdecimal ` `a = BigMath.``E``(BigDecimal(``"10"``)).to_s ` ` `  `# declaring bigdecimal ` `b = BigMath.``E``(BigDecimal(``"032"``)).to_s ` ` `  `# declaring bigdecimal ` `c = BigMath.``E``(BigDecimal(``"1"``)).to_s ` ` `  ` `  `# E() method ` `puts ``"BigDecimal a E method : #{a}\n\n"` ` `  `puts ``"BigDecimal b E method : #{b}\n\n"` ` `  `puts ``"BigDecimal c E method : #{c}\n\n"`

Output :

```BigDecimal a E method : 0.2718281828E1

BigDecimal b E method : 0.27182818284590452353602874713527E1

BigDecimal c E method : 0.3E1

```

Example #2 :

 `# Ruby code for BigDecimal.E() method ` ` `  `# loading library ` `require ``'bigdecimal'` `require ``'bigdecimal/util'` ` `  `require ``"bigdecimal/math"` ` `  `include BigMath ` ` `  `# declaring bigdecimal ` `a = BigMath.``E``(BigDecimal(``"120"``)).to_s ` ` `  `# declaring bigdecimal ` `b = BigMath.``E``(BigDecimal(``"1.0"``)).to_s ` ` `  `# declaring bigdecimal ` `c = BigMath.``E``(BigDecimal(``"3"``)).to_s ` ` `  `# E() method ` `puts ``"BigDecimal a E method : #{a}\n\n"` ` `  `puts ``"BigDecimal b E method : #{b}\n\n"` ` `  `puts ``"BigDecimal c E method : #{c}\n\n"`

Output :

```BigDecimal a E method : 0.271828182845904523536028747135266249775724709369995957496696762772407663035354759457138217852516642742746639193200305992E1

BigDecimal b E method : 0.3E1

BigDecimal c E method : 0.272E1

```

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