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+//Example 1.17: Addition of two signed numbers -5 and -4
+clc;
+x=bitcmp(5,4) //finds complement of 5
+y=1;
+u=x+y //1 is added to the complement
+l=bitcmp(4,4) //finds complement of 5
+m=1;
+n=l+m //1 is added to the complement
+z=n+u;
+r = dec2bin(z); // binary equivalent of decimal number
+disp('The binary number is = ');
+disp(r) 
+disp('The msb is discarded, and binary number becomes')
+disp('0111')
+disp('This time, two negetive numbers produced a sum that looks positive.')