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+//Example 1.21: Overflow for unsigned numbers in Example 1.21(a) and for signed numbers in Example 1.21(b)
+clc;
+disp('Example 1.21(a)')
+x=bitcmp(7,4) //finds complement of 5
+y=1;
+u=x+y //1 is added to the complement
+w=5
+z=w+u;
+r = dec2bin(z); // binary equivalent of decimal number
+disp('The binary number is = ');
+disp(r) 
+disp('Example 1.21(b)')
+x=7
+y=5;
+u=x+y //1 is added to the complement
+r = dec2bin(u); // binary equivalent of decimal number
+disp('The binary number is = ');
+disp(r)