AT&T 6300 Programmer's Manual page 83

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Variable Types

Strings may be compared using the same

relational operators that are used with

String comparisons are made by taking one

character at a time from each string and

comparing the ASCII codes. If all the ASCII

codes are the same, the strings are equal. If

the ASCII codes differ, the lower code number

precedes the higher. If during string

comparison the end of one string is reached,

the shorter string is said to be smaller.

Leading and trailing blanks are significant.

BS< "9/12/78"

Thus, string comparisons can be used to test

string values or to alphabetize strings. All

string constants used in comparison

expressions must be enclosed in quotation

Note that lower case letters have higher ASCII

codes than upper case letters.

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