Mark Wickens

MID$

Purpose

Returns a substring of a specified length from a specified position within a string.

Format

MID$    ( string     , position       [ , number of characters ] )
          └─┬──┘       └──┬───┘           └─────────┬────────┘
   String expression  Numeric expression     Numeric expression

Example

MID$(A$, 5, 3)

Parameters

1. string: String expression
2. position: Numeric expression truncated to an integer in the range of 1 ≦ position < 256.
3. number of characters: Numeric expression truncated to an integer in the range of 0 ≦ number of characters < 256. The default option is from the specified position to the end of the string when this parameter is omitted.

Explanation

1. Returns a substring of a specified length from a specified position within a string. A substring from the specified position to the end of the string is returned when the length of the substring is not specified.
2. A substring of length 0 (null) is returned when the specified position exceeds the length of the string.
3. A substring from the specified position to the end of the string is returned when the specified number of characters is greater than the number of characters from the specified position to the end of the string.

See

• RIGHT$
• LEFT$

Sample Program

10  A$="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
20  INPUT "1 TO 26 FROM"; B
30  PRINT "1 TO "; 27-B; " TO ";
40  INPUT E
50  S$ = MID$(A$, B, E)
60  PRINT S$
70  END

Uses numeric input to produce alphabetic series of a specified number of characters starting from a specified position.