| Data Type | Bytes | Description |
|---|---|---|
| BYTE (INTEGER*1) | 1 (8 bits) | A BYTE declaration is a signed integer data type equivalent to INTEGER*1 or INTEGER (KIND=1). |
| INTEGER | 1, 2, 4, or 8 | Signed integer whose size is controlled by a kind type parameter or, if a kind type parameter (or size specifier) is omitted, certain FORTRAN command qualifiers (see Section 8.2.1). |
| INTEGER (KIND=1) INTEGER*1 | 1 (8 bits) | Signed integer value from --128 to 127 (--2**7 to 2**7--1). Unsigned values from 0 to 255 (2**8-1) |
| INTEGER (KIND=2) INTEGER*2 | 2 (16 bits) | Signed integer value from --32,768 to 32,767 (--2**15 to 2**15--1). Unsigned values from 0 to 65535 (2**16-1) 1. |
| INTEGER (KIND=4) INTEGER*4 | 4 (32 bits) | Signed integer value from --2,147,483,648 to 2,147,483,647 (--2**31 to 2**31--1). Unsigned values from 0 to 4,294,967,295 (2**32-1) 1. |
| INTEGER (KIND=8) INTEGER*8 | 8 (64 bits) | Signed integer value from --9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 (--2**63 to 2**63--1). |
| LOGICAL | 1, 2, 4, or 8 | Logical value whose size is controlled by a kind type parameter or, if a kind type parameter (or size specifier) is omitted, certain FORTRAN command qualifiers (see Section 8.3). |
| LOGICAL (KIND=1) LOGICAL*1 | 1 (8 bits) | Logical values .TRUE. or .FALSE. |
| LOGICAL (KIND=2) LOGICAL*2 | 2 (16 bits) | Logical values .TRUE. or .FALSE. 2 |
| LOGICAL (KIND=4) LOGICAL*4 | 4 (32 bits) | Logical values .TRUE. or .FALSE. 2 |
| LOGICAL (KIND=8) LOGICAL*8 | 8 (64 bits) | Logical values .TRUE. or .FALSE. 2 |
| REAL | 4 or 8 | Real floating-point numbers whose size is controlled by a kind type parameter or, if a kind type parameter (or size specifier) is omitted, by using the FORTRAN command /REAL_SIZE qualifier. To control the floating-point format used in memory, use the FORTRAN command /FLOAT qualifier. |
| REAL (KIND=4) REAL*4 | 4 (32 bits) | Single-precision real floating-point values in IEEE S_float or VAX F_float formats. IEEE S_float normalized values range from 1.17549435E--38 to 3.40282347E38. Values between 1.17549429E--38 and 1.40129846E--45 are denormalized 3. VAX F_float values range from 0.293873588E--38 to 1.7014117E38. |
| DOUBLE PRECISION REAL (KIND=8) REAL*8 | 8 (64 bits) | Double-precision real floating-point values in IEEE T_float, VAX G_float, or VAX D_float formats. IEEE T_float normalized values range from 2.2250738585072013D--308 to 1.7976931348623158D308. Values between 2.2250738585072008D--308 and 4.94065645841246544D--324 are denormalized 3. VAX G_float values range from 0.5562684646268004D--308 to 0.89884656743115785407D308. VAX D_float values range from 0.2938735877055719D--38 to 1.70141183460469229D38. You can change the data size of DOUBLE PRECISION declarations from REAL (KIND=8) to REAL (KIND=16) with the FORTRAN command /DOUBLE_SIZE qualifier. |
| REAL (KIND=16) REAL*16 | 16 (128 bits) | Extended-precision real floating-point values in IEEE-like X_float format ranging from 6.475175119438025110924 4389582276465524996Q-4966 to 1.189731495357231765085 759326628007016196477Q4932. The smallest normalized number is 3.362103143112093506262 677817321753Q-4932. |
| COMPLEX | 8, 16, or 32 | Complex floating-point numbers whose size is controlled by a kind type parameter or, if a kind type parameter (or size specifier) is omitted, the FORTRAN command /REAL_SIZE qualifier. To control the floating-point format used in memory, use the FORTRAN command /FLOAT qualifier. |
| COMPLEX (KIND=4) COMPLEX*8 | 8 (64 bits) | Single-precision complex floating-point values in a pair of floating-point parts: real and imaginary. Use the IEEE S_float or VAX F_float format. IEEE S_float real and imaginary parts range from 1.17549435E--38 to 3.40282347E38. Values between 1.17549429E--38 and 1.40129846E--45 are denormalized 3. VAX F_float real and imaginary parts range from 0.293873588E--38 to 1.7014117E38. |
| DOUBLE COMPLEX COMPLEX (KIND=8) COMPLEX*16 | 16 (128 bits) | Double-precision complex floating-point values in a pair of parts: real and imaginary. Use the IEEE T_float, VAX G_float, or VAX D_float format. IEEE T_float format real and imaginary parts each range from 2.2250738585072013D-308 to 1.7976931348623158D308. Values between 2.2250738585072008D--308 and 4.94065645841246544D--324 are denormalized 3. VAX G_float format real and imaginary parts each range from 0.5562684646268004D--308 to 0.89884656743115785407D308. VAX D_float format real and imaginary parts each range from 0.2938735877055719D--38 to 1.70141183460469229D38. |
| COMPLEX (KIND=16) COMPLEX*32 | 32 (256 bits) | Extended-precision complex floating-point values in a pair of IEEE X_float format parts: real and imaginary. The real and imaginary parts each range from 6.475175119438025110924 4389582276465524996Q-4966 to 1.189731495357231765085 759326628007016196477Q4932. |
| CHARACTER | 1 byte (8 bits) per character | Character data represented by character code convention. Character declarations can be in the form CHARACTER(LEN= n), CHARACTER( n), or CHARACTER* n, where n is the number of bytes or n can be (*) to indicate passed-length format. |
| HOLLERITH | 1 byte (8 bits) per Hollerith character | Hollerith constants. |
1This range is allowed for assignment to variables of this type, but the data type is treated as signed in arithmetic operations.
2Logical data type ranges correspond to their comparable integer data type ranges. For example, in LOGICAL (KIND=2) L, the range for L is the same as the range for INTEGER (KIND=2) integers.
3You cannot write a constant for a denormalized number. For more information on floating-point underflow, see Section 2.3.24.
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