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## 6.13 Numerical functions

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### 6.13.1 `dacos`, `dasin`, `datan`, `dcos`, `dsin`, `dtan`

dacos(num)

:: Get the value of Arccos of num.

dasin(num)

:: Get the value of Arcsin of num.

datan(num)

:: Get the value of Arctan of num.

dcos(num)

:: Get the value of cos of num.

dsin(num)

:: Get the value of sin of num.

dtan(num)

:: Get the value of tan of num.

return

floating point number

num

number

• Compute numerical values of trigonometric functions.
• These functions use the standard mathematical library of C language. So results depend on operating systems and a C compilers.
```[0] 4*datan(1);
3.14159
```

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### 6.13.2 `dabs`, `dexp`, `dlog`, `dsqrt`

dabs(num)

:: Get the absolute value of num.

dexp(num)

:: Get the value of expornent of num.

dlog(num)

:: Get the value of logarithm of num.

dsqrt(num)

:: Get the value of square root of num.

return

floating point number

num

number

• Compute numerical values of elementary functions.
• These functions use the standard mathematical library of C language. So results depend on operating systems and a C compilers.
```[0] dexp(1);
2.71828
```

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### 6.13.3 `ceil`, `floor`, `rint`, `dceil`, `dfloor`, `drint`

ceil(num)
dceil(num)

:: Get the ceiling integer of num.

floor(num)
dfloor(num)

:: Get the floor integer of num.

rint(num)
drint(num)

:: Get the round integer of num.

return

integer

num

number

```[0] dceil(1.1);
1
```

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