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+// Problem 5.4,Page no.124
+
+clc;clear;
+close;
+
+b=10 //cm //width of beam
+d=20 //cm depth of beam
+
+sigma=8 //N/mm**2 //Max bending stress
+W=5000 //N/m**2 //Load of floor
+A=450 //cm**2 //Area of joist
+L=5 //m //span of floor
+
+//Calculations
+//Let x be the centre to centre spacingof the joists
+
+//A_1=5*x**2 //m**2 //Area  of floor between any two joists
+//W_1=5*x*W //N //total load supported by one interior joist
+//M=W_1*L*8**-1 //Max bending moment 
+I=1*12**-1*b*(d*10**-2)**3*10**-2 //m**4 //M.I of joist
+y=0.15 //cm //Distance of of farthest fibre
+M=I*y**-1*sigma //N*m
+
+//Now equating to max bending moment we get
+x=(18000*8)*(25000*5)**-1
+
+//Result
+printf("The Max Bending Moment is %.2f m",x)