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The size of A is 10 and the size of B is 100 (10 x 10). The number of elements of an array is called its size. When an array name is qualified by a subscript it refers to an individual element of the sequence. When an array name is used alone it refers to the entire sequence starting with the first element. An array is referenced by a single symbolic name. &TODAY I = 12345, X(1) = 12345, X(3:4) = 2*1.5, I=6, ! commentĪn array is a compound data object that consists of a sequence of data elements all of the same type and type parameters. INTEGER I REAL X (8) CHARACTER (11) P COMPLEX Z LOGICAL G PAD= character variable Other I/O StatementsĪ list may contain IOSTAT and ERR specifiers. In addition to ERR and IOSTAT, ilist may contain specifiers The INQUIRE is used to obtain information about the The STATUS specifier is a character expression that must beĮqual to either “KEEP” or “DELETE”. The CLOSE statement is used to disconnect a unit from anĬlist may contain IOSTAT, ERR, and STATUS specifiers. To indicate the name of the file, the type and form of theĬonnection, and the position at open. In addition to ERR and IOSTAT, olist may contain specifiers The OPEN statement is be used to connect to an existing file,Ĭreate a file, or modify an existing file connection. Where cilist is the control information list. The WRITE statement provides the Fortran mechanism for The cilistĬontains a unit specifier and optionally specifiers for format,Įrror, end-of-file, end-of-record, name list, record, advance, The general form of the READ statement can take two forms: Tire = 22.0 * 3.14159 ! inches per 1 revolution There are also auxiliary input/output for manipulating external files such as opening and closing files, rewinding and backspacing files, and inquiring about files. Data transfer can be either formatted or unformatted. Input is reading output is called writing. Input and output statements or data transfer statements provide the means through which Fortran programs communicate data to external devices. Of five or fewer digits and is output to standard out. The optional string s may be a CHARACTER constant or string Program execution is with the STOP statement. Normally, program executions ends when the END statement IfĮncountered in a main program it terminates execution ifĮncountered in a subroutine or function subprogram it has the A source file itself may contain more than one Terminates the range of an individual program unit within a Statements is executed, otherwise the second block ofĮvery program unit must have an END statement which Where s is the label of a statement, e is an integer expression, and i is the symbolic name of an integer variable that has been assigned the label of a statement with the ASSIGN statement. It begins with an initial keyword, may have intermediate keywords, and ends with a termination statement. The general form of a control statement is a block construct. Vlist contains the symbolic names of variables, arrays, array elements, substrings, and implied DO lists clist contains the constants which will be used to provide the initial values for the items in vlist. DATA statements may appear only after the declaration statements in the program unit in which they appear. Variables, substrings, arrays, and array elements are given initial values with DATA statements. INTEGER, PARAMETER :: DP=SELECTED_REAL_KIND(15,307) INTEGER, PARAMETER :: SP=SELECTED_REAL_KIND(6,37) INTEGER, PARAMETER :: I8=SELECTED_INT_KIND(18) INTEGER, PARAMETER :: I4=SELECTED_INT_KIND(9) INTEGER, PARAMETER :: I2=SELECTED_INT_KIND(4) INTEGER, PARAMETER :: I1=SELECTED_INT_KIND(2) SELECTED_REAL_KIND(p,r) p and r are integer SELECTED_INT_KIND(x) x is an integer expression Language features are provided for inquiring about the numeric model and specifying the kind of the data entity. The Fortran 90 concept of kind provides the means for selecting and specifying the numeric model of integer and real data both variables and constants.
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PRINT *,”Circumference=”,Circumference(r)ĮND PROGRAM Circle Non-Optimized vs.
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