QBASIC Symbolic Constants
Constants are fixed values (data) that are used in program and they do not change during program execution. Constants are predefined values that do not change during program execution.
CLS REM to calculate area of circle INPUT "Enter radius in centimeter"; R CONST PI = 22/7 LET AREA=PI*R^2 PRINT "area of circle = "; AREA; "sq. cm" End