Campbell Scientific CR3000 CR3000 Micrologger - Page 242
String Operators, 8.13.2 String Concatenation
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Section 7. Installation 7.8.13.1 String Operators The table String Operators (p. 242) list and describes available string operators. String operators are case sensitive. Table 40. String Operators Operator & + Description Concatenates strings. Forces numeric values to strings before concatenation. Example 1 & 2 & 3 & "a" & 5 & 6 & 7 = "123a567" Adds numeric values until a string is encountered. When a string is encountered, it is appended to the sum of the numeric values. Subsequent numeric values are appended as strings. Example: 1 + 2 + 3 + "a" + 5 + 6 + 7 = "6a567" "Subtracts" NULL ("") from the end of ASCII characters for conversion to an ASCII code (LONG data type). Example: "a" - "" = 97 ASCII codes of the first characters in each string are compared. If the difference between the codes is zero, codes for the next characters are compared. When unequal codes or NULL are encountered (NULL terminates all strings), the difference between the last compared ASCII codes is returned. Examples: Note - ASCII code for a = 97, b = 98, c = 99, d = 100, e = 101, and all strings end with NULL. Difference between NULL and NULL "abc" - "abc" = 0 Difference between e and c "abe" - "abc" = 2 Difference between c and b "ace" - "abe" = 1 Difference between d and NULL "abcd" - "abc" = 100 ASCII codes of the first characters in each string are compared. If the difference between the codes is zero, codes for the next characters are compared. When unequal codes or NULL are encountered (NULL terminates all strings), the requested comparison is made. If the comparison is true, -1 or True is returned. If false, 0 or False is returned. Examples: Expression x = "abc" = "abc" x = "abe" = "abc" x = "ace" > "abe" Result x = -1 or True x = 0 or False x = -1 or True 7.8.13.2 String Concatenation Concatenation is the building of strings from other strings ("abc123"), characters ("a" or chr()), numbers, or variables. 242
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