CHAPTER 3 INPUT/OUTPUT List-directed (free formatted) input/output As in section 2.6 Formatted input/output General Form: Read format-specifier, input-list.

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CHAPTER 3 INPUT/OUTPUT List-directed (free formatted) input/output As in section 2.6 Formatted input/output General Form: Read format-specifier, input-list

1.* (an asterisk) It indicates list-directed input (free format). Example: read *,a,j 2.A character constant or a character variable (or expression or array) whose value specifies the format for the input. Example: read ‘(I3,I4,I7)’,j,k,l 3.The label of a FORMAT statement label FORMAT (list of format descriptors)

Descriptors Example: Read 10, I, r, t 10 format (2x, i5, f7.3, f6.2)

X- Descriptor It skips positions on the data line General Form: nX I- Descriptor It is used when reading a value into an integer variable. General Form: nIw w : width of the field and n is the repetition indicator. Example: read 10,m,n 10 format(5x,i5,i7)

F- Descriptor It is used when reading a value into a real variable. General Form: Fw.d w: total number of positions to use from the data line and d: number of decimal positions. REMARKS: If there is a decimal point included in the w positions, the value will be stored as it was entered, regardless of what value has been given to d. If there is no decimal point within the specified positions, the value of d is used to position a decimal place before storing the value. If the characters 1246 are read using F4.1, the value stored is

Example: Read 10, I, r, t 10 format (2x, i5, f7.3, f6.2) Example: read 50,a,c,k 50 format(2x,2f5.1,2x,i4) For: a=80.1, c=36.5 and k = 40, the input line should be as: x2f5.12xI4

E- Descriptor used to read a variable entered in an exponential form. General Form: Ew.d W: total number of positions to use from the data line and d: the number of decimal positions. Example: read 30,Iter,error 30 format(2x,i5,2x,e7.2) Data line, Iter=12 and error=0.25e-09: 12.25E-09 2xI52xE7.2

A-Descriptor used to read character variable. General Form: Aw Where w represents the number of positions to be read.

Output Formatting Similar to input formatting Only one difference  Carriage Character Control  Single space used to control output Carriage Character Control characters to be printed

Example: Print 4 4 Format(‘Fortran course') The buffer output line: And the output is: Fortrancourse ortrancourse Example: Print 4 4 Format(1x‘Fortran course') The buffer output line: And the output is: FortranCourse Fortrancourse

More Examples Example 1: Given: K=20, L=-30, M=-450 Print 4, K,L,M 4 Format(1X,I3,2X,I2,3X,I4) Example 2: Given: T= , R= Print 4, T,R 4 Format(1X,E10.2,3X,F7.3)