H to I
- HOSTNAM
Portability Function: Returns the current host computer name. This function can also be specified as HOSTNM.
- HUGE
Inquiry Intrinsic Function (Generic): Returns the largest number in the model representing the same type and kind parameters as the argument.
- HYPOT
Elemental Intrinsic Function (Generic): Returns the value of the Euclidean distance of the arguments.
- IACHAR
Elemental Intrinsic Function (Generic): Returns the position of a character in the ASCII character set, even if the processor's default character set is different. In Intel® Fortran, IACHAR is equivalent to the ICHAR function.
- IALL
Transformational Intrinsic Function (Generic): Reduces an array with a bitwise AND operation.
- IAND
Elemental Intrinsic Function (Generic): Performs a logical AND on corresponding bits. This function can also be specified as AND.
- IANY
Transformational Intrinsic Function (Generic): Reduces an array with a bitwise OR operation.
- IARGC
Inquiry Intrinsic Function (Specific): Returns the index of the last command-line argument. It cannot be passed as an actual argument. This function can also be specified as IARG or NUMARG.
- IBCHNG
Elemental Intrinsic Function (Generic): Reverses the value of a specified bit in an integer.
- IBCLR
Elemental Intrinsic Function (Generic): Clears one bit to zero.
- IBITS
Elemental Intrinsic Function (Generic): Extracts a sequence of bits (a bit field).
- IBSET
Elemental Intrinsic Function (Generic): Sets one bit to 1.
- ICHAR
Elemental Intrinsic Function (Generic): Returns the position of a character in the processor's character set.
- IDATE Intrinsic Procedure
Intrinsic Subroutine (Generic): Returns three integer values representing the current month, day, and year. IDATE can be used as an intrinsic subroutine or as a portability routine. It is an intrinsic procedure unless you specify USE IFPORT. Intrinsic subroutines cannot be passed as actual arguments.
- IDATE Portability Routine
Portability Subroutine: Returns the month, day, and year of the current system. IDATE can be used as a portability subroutine or as an intrinsic procedure. It is an intrinsic procedure unless you specify USE IFPORT.
- IDATE4
Portability Subroutine: Returns the month, day, and year of the current system.
- IDENT
General Compiler Directive: Specifies a string that identifies an object module. The compiler places the string in the identification field of an object module when it generates the module for each source program unit.
- IDFLOAT
Portability Function: Converts an INTEGER(4) argument to double-precision real type.
- IEEE_CLASS
Elemental Module Intrinsic Function (Generic): Returns the IEEE class.
- IEEE_COPY_SIGN
Elemental Module Intrinsic Function (Generic): Returns an argument with a copied sign. This is equivalent to the IEEE copysign function.
- IEEE_FLAGS
Portability Function: Gets, sets or clears IEEE flags for rounding direction and precision as well as queries or controls exception status. This function provides easy access to the modes and status required to use the features of IEEE Standard 754-1985 arithmetic in a Fortran program.
- IEEE_GET_FLAG
Elemental Module Intrinsic Subroutine (Generic): Returns whether an exception flag is signaling.
- IEEE_GET_HALTING_MODE
Elemental Module Intrinsic Subroutine (Generic): Stores the halting mode for an exception.
- IEEE_GET_ROUNDING_MODE
Intrinsic Module Subroutine (Generic): Stores the current IEEE rounding mode.
- IEEE_GET_STATUS
Intrinsic Module Subroutine (Generic): Stores the current state of the floating-point environment.
- IEEE_GET_UNDERFLOW_MODE
Intrinsic Module Subroutine (Generic): Stores the current underflow mode.
- IEEE_HANDLER
Portability Function: Establishes a handler for IEEE exceptions.
- IEEE_IS_FINITE
Elemental Module Intrinsic Function (Generic): Returns whether an IEEE value is finite.
- IEEE_IS_NAN
Elemental Module Intrinsic Function (Generic): Returns whether an IEEE value is Not-a-Number (NaN).
- IEEE_IS_NEGATIVE
Elemental Module Intrinsic Function (Generic): Returns whether an IEEE value is negative.
- IEEE_IS_NORMAL
Elemental Module Intrinsic Function (Generic): Returns whether an IEEE value is normal.
- IEEE_LOGB
Elemental Module Intrinsic Function (Generic): Returns a floating-point value equal to the unbiased exponent of the argument. This is equivalent to the IEEE logb function.
- IEEE_NEXT_AFTER
Elemental Module Intrinsic Function (Generic): Returns the next representable value after X toward Y. This is equivalent to the IEEE nextafter function.
- IEEE_REM
Elemental Module Intrinsic Function (Generic): Returns the result value from a remainder operation. This is equivalent to the IEEE rem function.
- IEEE_RINT
Elemental Module Intrinsic Function (Generic): Returns an integer value rounded according to the current rounding mode.
- IEEE_SCALB
Elemental Module Intrinsic Function (Generic): Returns the exponent of a radix-independent floating-point number. This is equivalent to the IEEE scalb function.
- IEEE_SELECTED_REAL_KIND
Transformational Module Intrinsic Function (Generic): Returns the the value of the kind parameter of an IEEE REAL data type.
- IEEE_SET_FLAG
Elemental Module Intrinsic Function (Generic): Assigns a value to an exception flag.
- IEEE_SET_HALTING_MODE
Elemental Module Intrinsic Function (Generic): Controls halting or continuation after an exception.
- IEEE_SET_ROUNDING_MODE
Intrinsic Module Subroutine (Generic): Sets the IEEE rounding mode.
- IEEE_SET_STATUS
Intrinsic Module Subroutine (Generic): Restores the state of the floating-point environment.
- IEEE_SET_UNDERFLOW_MODE
Intrinsic Module Subroutine (Generic): Sets the current underflow mode.
- IEEE_SUPPORT_DATATYPE
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE arithmetic.
- IEEE_SUPPORT_DENORMAL
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE denormalized numbers.
- IEEE_SUPPORT_DIVIDE
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE divide.
- IEEE_SUPPORT_FLAG
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE exceptions.
- IEEE_SUPPORT_HALTING
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE halting.
- IEEE_SUPPORT_INF
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE infinities.
- IEEE_SUPPORT_IO
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE base conversion rounding during formatted I/O.
- IEEE_SUPPORT_NAN
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE Not-a-Number feature.
- IEEE_SUPPORT_ROUNDING
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE rounding mode.
- IEEE_SUPPORT_SQRT
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE SQRT (square root).
- IEEE_SUPPORT_STANDARD
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports IEEE features defined in the standard.
- IEEE_SUPPORT_UNDERFLOW_CONTROL
Inquiry Module Intrinsic Function (Generic): Returns whether the processor supports the ability to control the underflow mode.
- IEEE_UNORDERED
Elemental Module Intrinsic Function (Generic): Returns whether one or more of the arguments is Not-a-Number (NaN). This is equivalent to the IEEE unordered function.
- IEEE_VALUE
Elemental Module Intrinsic Function (Generic): Creates an IEEE value.
- IEOR
Elemental Intrinsic Function (Generic): Performs an exclusive OR on corresponding bits. This function can also be specified as XOR or IXOR.
- IERRNO
Portability Function: Returns the number of the last detected error from any routines in the IFPORT module that return error codes.
- IF - Arithmetic
Statement: Conditionally transfers control to one of three statements, based on the value of an arithmetic expression. It is an obsolescent language feature in Standard Fortran.
- IF - Logical
Statement: Conditionally executes one statement based on the value of a logical expression. (This statement was called a logical IF statement in FORTRAN 77.)
- IF Construct
Statement: Conditionally executes one block of constructs or statements depending on the evaluation of a logical expression. (This construct was called a block IF statement in FORTRAN 77.)
- IF Directive Construct
General Compiler Directive: A conditional compilation construct that begins with an IF or IF DEFINED directive. IF tests whether a logical expression is .TRUE. or .FALSE.. IF DEFINED tests whether a symbol has been defined.
- IF DEFINED Directive
Statement: Marks the start of an IF Directive Construct.
- IFIX
Elemental Intrinsic Function (Generic): Converts a single-precision real argument to an integer by truncating.
- IFLOATI, IFLOATJ
Portability Functions: Convert an integer to single-precision real type.
- ILEN
Inquiry Intrinsic Function (Generic): Returns the length (in bits) of the two's complement representation of an integer.
- IMAGE_INDEX
Inquiry Intrinsic Function (Generic): Converts cosubscripts to an image index.
- IMAGESIZE, IMAGESIZE_W (W*S)
Graphics Functions: Return the number of bytes needed to store the image inside the specified bounding rectangle. IMAGESIZE is useful for determining how much memory is needed for a call to GETIMAGE.
- IMPLICIT
Statement: Overrides the default implicit typing rules for names. (The default data type is INTEGER for names beginning with the letters I through N, and REAL for names beginning with any other letter.)
- IMPORT
Statement: Makes host entities accessible in the interface body of an interface block. It takes the following form:
- INCHARQQ (W*S)
QuickWin Function: Reads a single character input from the keyboard and returns the ASCII value of that character without any buffering.
- INCLUDE
Statement: Directs the compiler to stop reading statements from the current file and read statements in an included file or text module.
- INDEX
Elemental Intrinsic Function (Generic): Returns the starting position of a substring within a string.
- INITIALIZEFONTS (W*S)
Graphics Function: Initializes Windows* fonts.
- INITIALSETTINGS (W*S)
QuickWin Function: Initializes QuickWin.
- INLINE, FORCEINLINE, and NOINLINE
General Compiler Directives: Tell the compiler to perform the specified inlining on routines within statements or DO loops.
- INMAX
Portability Function: Returns the maximum positive value for an integer.
- INQFOCUSQQ (W*S)
QuickWin Function: Determines which window has the focus.
- INQUIRE
Statement: Returns information on the status of specified properties of a file, logical unit, or directory. It takes one of the following forms:
- INSERTMENUQQ (W*S)
QuickWin Function: Inserts a menu item into a QuickWin menu and registers its callback routine.
- INT
Elemental Intrinsic Function (Generic): Converts a value to integer type.
- INTC
Portability Function: Converts an INTEGER(4) argument to INTEGER(2) type.
- INT_PTR_KIND
Inquiry Intrinsic Function (Specific): Returns the INTEGER KIND that will hold an address. This is a specific function that has no generic function associated with it. It cannot be passed as an actual argument.
- INTEGER Statement
Statement: Specifies the INTEGER data type.
- INTEGER Directive
General Compiler Directive: Specifies the default integer kind.
- INTEGERTORGB (W*S)
QuickWin Subroutine: Converts an RGB color value into its red, green, and blue components.
- INTENT
Statement and Attribute: Specifies the intended use of one or more dummy arguments.
- INTERFACE
Statement: Defines an explicit interface for an external or dummy procedure. It can also be used to define a generic name for procedures, a new operator for functions, and a new form of assignment for subroutines.
- INTERFACE TO
Statement: Identifies a subprogram and its actual arguments before it is referenced or called.
- INTRINSIC
Statement and Attribute: Allows the specific name of an intrinsic procedure to be used as an actual argument.
- INUM
Elemental Intrinsic Function (Specific): Converts a character string to an INTEGER(2) value. This function cannot be passed as an actual argument.
- IOR
Elemental Intrinsic Function (Generic): Performs an inclusive OR on corresponding bits. This function can also be specified as OR.
- IPARITY
Transformational Intrinsic Function (Generic): Returns the result of a bitwise exclusive OR operation.
- IPXFARGC
POSIX Function: Returns the index of the last command-line argument.
- IPXFCONST
POSIX Function: Returns the value associated with a constant defined in the C POSIX standard.
- IPXFLENTRIM
POSIX Function: Returns the index of the last non-blank character in an input string.
- IPXFWEXITSTATUS (L*X, M*X)
POSIX Function: Returns the exit code of a child process.
- IPXFWSTOPSIG (L*X, M*X)
POSIX Function: Returns the number of the signal that caused a child process to stop.
- IPXFWTERMSIG (L*X, M*X)
POSIX Function: Returns the number of the signal that caused a child process to terminate.
- IRAND, IRANDM
Portability Functions: Return random numbers in the range 0 through (2**31)-1, or 0 through (2**15)-1 if called without an argument.
- IRANGET
Portability Subroutine: Returns the current seed.
- IRANSET
Portability Subroutine: Sets the seed for the random number generator.
- IS_CONTIGUOUS
Inquiry Intrinsic Function (Generic): Tests the contiguity of an array.
- IS_IOSTAT_END
Elemental Intrinsic Function (Generic): Tests for an end-of-file condition.
- IS_IOSTAT_EOR
Elemental Intrinsic Function (Generic): Tests for an end-of-record condition.
- ISATTY
Portability Function: Checks whether a logical unit number is a terminal.
- ISHA
Elemental Intrinsic Function (Generic): Arithmetically shifts an integer left or right by a specified number of bits.
- ISHC
Elemental Intrinsic Function (Generic): Rotates an integer left or right by specified number of bits. Bits shifted out one end are shifted in the other end. No bits are lost.
- ISHFT
Elemental Intrinsic Function (Generic): Performs a logical shift.
- ISHFTC
Elemental Intrinsic Function (Generic): Performs a circular shift of the rightmost bits.
- ISHL
Elemental Intrinsic Function (Generic): Logically shifts an integer left or right by the specified bits. Zeros are shifted in from the opposite end.
- ISNAN
Elemental Intrinsic Function (Generic): Tests whether IEEE* real (S_floating, T_floating, and X_floating) numbers are Not-a-Number (NaN) values.
- ITIME
Portability Subroutine: Returns the time in numeric form.
- IVDEP
General Compiler Directive: Assists the compiler's dependence analysis of iterative DO loops.