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8. Characters and Strings

8. Characters and Strings. HTML version. Properties. Length of every character variable must be specified in advance: CHARACTER STR*10 CHARACTER STRA(20)*10. Assumed Length Declarations. Character constants : CHARACTER STR*(*) PARAMETER ( STR  'This is a string' )

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8. Characters and Strings

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  1. 8. Characters and Strings HTML version

  2. Properties • Length of every character variable must be specified in advance: CHARACTER STR*10 CHARACTER STRA(20)*10

  3. Assumed Length Declarations • Character constants : CHARACTER STR*(*) PARAMETER ( STR  'This is a string' ) • Dummy character variable : CHARACTER STR*(*) Length of STR = Length of actual argument. STR is a passed-length dummy argument.

  4. Character assignments Padding and chopping are on the right. CHARACTER AUTHOR*30, SHORT*5, EXPAND*10 AUTHOR  'SHAKESPEARE, WILLIAM' SHORT  AUTHOR EXPAND = SHORT  SHORT is ‘SHAKE’ EXPAND is ‘SHAKE ’ ( with 5 trailing blanks )

  5. Character Substrings CHARACTER METAL*10 METAL  'CADMIUM'  METAL(2:4) gives ‘ADM’ METAL(:4) gives ‘CADM’ METAL(4:) gives ‘MIUM ’ ( with 3 trailing blanks ) METAL(8:8) gives ‘ ’ ( 1 blank )

  6. Character Expressions Concatenation operator // : ‘CAD’ // ‘MIUM’ gives ‘CADMIUM’ CHARACTER METAL*10 METAL  'CADMIUM'  METAL(4:) // METAL(2:4) gives ‘MIUM ADM’

  7. Character Intrinsic Functions CHAR ICHAR INDEX LEN LGE LGT LLE LGT

  8. CHAR(I) CHAR(48) gives 0 CHAR(65) gives A CHAR(97) gives a CHAR(1) gives Ctrl-A CHAR(27) gives ESC ICHAR(char) ICHAR(a) gives 106

  9. INDEX( string, pattern ) gives position of the 1st occurrence of pattern in string. Result is 0 if pattern is not in string. LEN(string) gives the length of string.

  10. Relational Expressions String1 .RO. String2 .EQ. .NE. .LT. .LE. .GT. .GE. ‘abc12’ .RO. ‘abcde’  ‘1’ .RO. ‘d’ LGE LGT LLE LGT LGE( ‘a’, ‘1’ ) is always equal to T.

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