Dear Mr. Coppola: really I solve using this: var valor1,valor2,valor3:integer; valor3:=round(power(valor1,valor2)); and declaring the unit "math" in uses. Thanks very much Ing. Héctor F. Fiandor hfiandor at infomed.sld.cu --------------------------------------- Red Telematica de Salud - Cuba CNICM - Infomed