PI

Syntax PI
Location QL ROM

This function is a constant number which returns the value of Pi with an error of 10^(-29). You can test the precision of PI with such a program:

100 p = PI - 3: PRINT "PI = 3.";
110 FOR n = 1 TO 35
120   p = p * 10
130   PRINT INT(p);
140   p = p - INT(p)
150 END FOR n
160 PRINT

CROSS-REFERENCE

The trigonometrical functions (SIN, TAN, ACOS etc) expect parameters in radians, so PI must be used in most cases. Another fundamental mathematical constant, e, can be obtained with EXP(1).