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+//developed in windows XP operating system 32bit
+//platform Scilab 5.4.1
+clc;clear;
+//example 16.22w
+//calculation of the speed of the car
+
+//given data
+nudash=440//frequency(in Hz) emitted by the wall
+nudashdash=480//frequency(in Hz) heard by the car driver
+v=330//speed(in m/s) of the sound in the air
+
+//calculation
+//frequency received by the wall..............nudash = (v/(v-u))*nu............(1)
+//frequency(in Hz) heard by the car driver....nudashdash = ((v+u)/v)*nudash....(2)
+//from above two equations,we get
+u=((nudashdash-nudash)/(nudashdash+nudash))*v//speed of the car
+
+printf('the speed of the car is %3.1f m/s or %d km/h',u,round(u*10^-3*60*60))