Table of Contents
- 1 What is logical data type in FORTRAN?
- 2 What are the basic data type in Fortran 77?
- 3 What is the final value of A in the following FORTRAN program?
- 4 What is logical data type?
- 5 What are variables in Fortran?
- 6 What are logical operators in Fortran?
- 7 What is index in FORTRAN?
- 8 What is a logical expression in FORTRAN 77?
- 9 What is the difference between Block and logical IF in Fortran?
- 10 Can logical expressions have values between -128 and 127?
What is logical data type in FORTRAN?
The BYTE data type provides a data type that uses only one byte of storage. It is a logical data type, and has the synonym, LOGICAL*1 . A variable of type BYTE can hold any of the following: One character. An integer between -128 and 127.
What are the basic data type in Fortran 77?
Size and Alignment of Data Types
| Fortran 77 Data Type | Size |
|---|---|
| BYTE X CHARACTER X CHARACTER* n X | 1 1 n |
| COMPLEX X COMPLEX*8 X DOUBLE COMPLEX X COMPLEX*16 X COMPLEX*32 X | 8 8 16 16 32 |
| DOUBLE PRECISION X REAL X REAL*4 X REAL*8 X REAL*16 X | 8 4 4 8 16 |
| INTEGER X INTEGER*2 X INTEGER*4 X INTEGER*8 X | 4 2 4 8 |
What is an expression in FORTRAN?
An expression is a combination of one or more operands, zero or more operators, and zero or more pairs of parentheses. An arithmetic expression evaluates to a single arithmetic value. A character expression evaluates to a single value of type character.
What is the final value of A in the following FORTRAN program?
For other than the default, you can declare variables as static or automatic in a STATIC @ , AUTOMATIC @, or IMPLICIT statement. See also the discussion of the -stackvar option in the Fortran User’s Guide . One usage of AUTOMATIC is to declare all automatic at the start of a function.
What is logical data type?
Description: The Logical Data Type is a special data type for data with only two possible values. These values can be construed as 0/1, true/false, yes/no, etc. The Logical Data Type requires only one bit of storage. For a single Logical field, the left-most (high-order) bit is used.
What is logical parameter?
Logic. In logic, the parameters passed to (or operated on by) an open predicate are called parameters by some authors (e.g., Prawitz, “Natural Deduction”; Paulson, “Designing a theorem prover”). Parameters locally defined within the predicate are called variables.
What are variables in Fortran?
A Fortran variable can be considered as a box that is capable of holding a single value of certain type. Thus, a variable has a name, the variable name and a type. The way of choosing a name for a variable must fulfill the rules of composing a Fortran identifier.
What are logical operators in Fortran?
Fortran – Logical Operators
| Operator | Description |
|---|---|
| .or. | Called Logical OR Operator. If any of the two operands is non-zero, then condition becomes true. |
| .not. | Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false. |
How do you write absolute value in FORTRAN?
ABS(A) computes the absolute value of A . The type of the argument shall be an INTEGER , REAL , or COMPLEX . Return value: The return value is of the same type and kind as the argument except the return value is REAL for a COMPLEX argument.
What is index in FORTRAN?
INDEX(a1,a2) returns an integer value indicating the starting position within the character string a1 of a substring identical to string a2 . If a2 occurs more than once in a1 , the starting position of the first occurrence is returned. If a2 does not occur in a1 , the value zero is returned.
What is a logical expression in FORTRAN 77?
FORTRAN 77 Language Reference Previous: Character Expressions Next: Relational Operator Logical Expressions A logical expressionis a sequence of one or more logical operands and logical operators. It evaluates to a single logical value. The operators can be any of the following.
What are the logical operators in forfortran?
Fortran has five LOGICAL operators that can only be used with expressions whose results are logical values ( i.e., .TRUE. or .FALSE. ). All LOGICAL operators have priorities lower than arithmetic and relational operators. Therefore, if an expression involving arithmetic, relational and logical operators, the arithmetic operators are evaluated
What is the difference between Block and logical IF in Fortran?
However, the BLOCK IF structure was incorporated into the standard in FORTRAN-77. The BLOCK IF is more versatile and builds more structure into your program, and eliminates the need for the Logical IF. It is preferable to use the BLOCK IF, and then the two different syntaxes will not confuse you.
Can logical expressions have values between -128 and 127?
If eis a logical expression, rather than an integer between -128 and 127, or a single character constant, then emust have a value of either true or false. Logical expressions of any size can be assigned to logical variables of any size. Assigning numerics to logicals is allowed.