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+//Reactions developed in beam
+//refer fig 8.6
+//Let RA and RB be the reactions at supports A and B
+//applying virtual work principle
+RB=(20/3)+(80/3) //kN
+RA=(40/3)+(40/3) //kN
+printf("Reactions are-\nRA=%.2f kN\nRB=%.2f kN",RA,RB)