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Manual Reference Pages  - int (3fortran)

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NAME

INT(3) - [TYPE:CONVERSION] Truncate towards zero and convert to integer

SYNOPSIS

result = int(a [,kind])

         elemental integer(kind=KIND) function int(a, KIND )

          TYPE(kind=**),intent(in) :: a
          integer,optional :: KIND

CHARACTERISTICS

o	a kind designated as ** may be any supported kind for the type
o	A shall be of type integer, real, or complex, or a boz-literal-constant.
o	KIND shall be a scalar integer constant expression.

DESCRIPTION

INT(3) truncates towards zero and return an integer.

OPTIONS

o	A : is the value to truncate towards zero
o	KIND : indicates the kind parameter of the result. If not present the returned type is that of default integer type.

RESULT

returns an integer variable applying the following rules:

CASE:

1.	If A is of type integer, INT(a) = a
2.	If A is of type real and |A| < 1, INT(A) equals 0. If |A| >= 1, then INT(A) equals the integer whose magnitude does not exceed A and whose sign is the same as the sign of A.
3.	If A is of type complex, rule 2 is applied to the real part of A.
4.	If a is a boz-literal constant, it is treated as an integer with the kind specified. The interpretation of a bit sequence whose most significant bit is 1 is processor dependent.

The result is undefined if it cannot be represented in the specified integer type.

EXAMPLES

Sample program:

    program demo_int
    use,intrinsic :: iso_fortran_env, only : int8, int16, int32, int64
    implicit none
    integer :: i = 42
    complex :: z = (-3.7, 1.0)
    real :: x=-10.5, y=10.5

       print *, int(x), int(y)

       print *, int(i)

       print *, int(z), int(z,8)
       ! elemental
       print *, int([-10.9,-10.5,-10.3,10.3,10.5,10.9])
       ! note int(3) truncates towards zero

       ! CAUTION:
       ! a number bigger than a default integer can represent
       ! produces an incorrect result and is not required to
       ! be detected by the program.
       x=real(huge(0))+1000.0
       print *, int(x),x
       ! using a larger kind
       print *, int(x,kind=int64),x

       print *, int(&
       & B"111111111111111111111111111111111111111111111111111111111111111",&
       & kind=int64)
       print *, int(O"777777777777777777777",kind=int64)
       print *, int(Z"7FFFFFFFFFFFFFFF",kind=int64)

       ! elemental
       print *
       print *,int([ &
       &  -2.7,  -2.5, -2.2, -2.0, -1.5, -1.0, -0.5, &
       &  0.0,   &
       &  +0.5,  +1.0, +1.5, +2.0, +2.2, +2.5, +2.7  ])

    end program demo_int

Results:

     >          -10   10
     >           42
     >           -3  -3
     >          -10  -10  -10   10   10  10
     >  -2147483648   2.14748467E+09
     >   2147484672   2.14748467E+09
     >   9223372036854775807
     >   9223372036854775807
     >   9223372036854775807
     >
     >  -2          -2          -2          -2          -1
     >  -1           0           0           0           1
     >   1           2           2           2           2

STANDARD

FORTRAN 77

SEE ALSO

AINT(3), ANINT(3), NINT(3), SELECTED_INT_KIND(3), CEILING(3), FLOOR(3)

Fortran intrinsic descriptions (license: MIT) @urbanjost

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Nemo Release 3.1

int (3fortran)

November 02, 2024

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