Basic computer language commands

Basic computer programming language

DEFINT/SNG/DBL/STR Statements

Purpose:

To declare variable types as integer, single-precision, double-precision, or string.

Syntax:

DEFtype letters

Comments:

type is INT (integer), SNG (single-precision number), DBL (double-precision number), or STR (string of 0-255 characters).

letters are letters (separated by commas) or range of letters of the alphabet.

A DEFtype statement declares that variable names beginning with the letter(s) specify that type of variable. However, a type declaration character (%,!,#,$) always takes precedence over a DEFtype statement in the typing of a variable.

If no type declaration statements are encountered, BASIC assumes all variables are single-precision. Single-precision is the default value.

Examples:

10 DEFDBL L-P

All variables beginning with the letters L, M, N, O, and P will be double-precision variables.

10 DEFSTR A
20 A="120#"

All variables beginning with the letter A will be string variables. The $ declaration is unnecessary in this example.

10 DEFINT I-N, W-Z
20 W$="120#"

All variables beginning with the letters I, J, K, L, M, N, W, X, Y, Z will be integer variables. W$ in Line 20 establishes a string variable beginning with the letter W. However, the variable W will remain an integer elsewhere in the program.

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