echo("-------------------------------------------------") f_precision=15; echo("f_precision = "); f_precision; config; "--------------------" PI; pi; Pi; pI; exp; gamma; phi; "-------------------------------------------------" f_precision=5; "f_precision = "; f_precision; config; "--------------------" pi; exp; gamma; phi; "-------------------------------------------------" f_precision=10; "f_precision = "; f_precision config; "--------------------" pi; exp; gamma; phi; "-------------------------------------------------" "f_precision = "; f_precision=15 config; "--------------------" pi; exp; gamma; phi; "-------------------------------------------------"