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+//ANALOG AND DIGITAL COMMUNICATION
+//BY Dr.SANJAY SHARMA
+//CHAPTER 11
+//Information Theory
+clear all;
+clc;
+printf("EXAMPLE 11.46(PAGENO 532)");
+
+//given
+P_x1 = .4//probability of first signal
+P_x2 = .19//probability of second signal
+P_x3 = .16//probability of third signal
+P_x4 = .15//probability of fourth signal
+P_x5 = .1//probability of fifth signal
+n1 = 1//number of bits in code obtained from table givenn textbook
+n2 = 2//number of bits in code obtained from table givenn textbook
+n3 = 2//number of bits in code obtained from table givenn textbook
+n4 = 3//number of bits in code obtained from table givenn textbook
+n5 = 3//number of bits in code obtained from table givenn textbook
+
+//calculations
+I_x1 = -log2(P_x1);
+I_x2 = -log2(P_x2);
+I_x3 = -log2(P_x3);
+I_x4 = -log2(P_x4);
+I_x5 = -log2(P_x5);
+H_x = P_x1*I_x1 +  P_x2*I_x2 +  P_x3*I_x3 +  P_x4*I_x4 +  P_x5*I_x5;//entropy
+L1 = P_x1*n1 + P_x2*n2 + P_x3*n3 + P_x4*n4 + P_x5*n5;
+neta1 = H_x/L1;
+P_neta1 = neta1*100//efficiency in percentage using Shannon Fano code
+L2 = P_x1*1 + (P_x2 + P_x3 +P_x4 +P_x5 )*3
+neta2 = H_x/L2;
+P_neta2 = neta2*100//efficiency in percentage using huffman code
+
+//results
+printf("\n\nEfficiency in percentage using Shannon Fano code = %2f percent",P_neta1)
+printf("\n\nEfficiency in percentage using huffman code   = %2f percent",P_neta2)
+printf("\n\nNote: There is mistake in the textbook in calculation of L using SHannon Fano code")