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diff --git a/2522/CH19/EX19.8/exm19_8.sce b/2522/CH19/EX19.8/exm19_8.sce
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+// page no 629
+// example no A.8
+// SUBTRACTION OF SIGNED NUMBERS
+clc;
+printf('Part a \n \n')
+printf('Minuend= FAH \n \n');
+printf('It is a negative no since D7= 1 for FAH, this must be represented in \n2s compliment form. \n');
+// finding 2's complement of subtrahend (FAH);
+m=hex2dec(['FA']);
+x=hex2dec(['62']);
+y=bitcmp(m,8); // 1's compliment of FAH
+z=y+1; // 2's compliment of FAH
+printf('2s compliment of minuend is= ');
+disp(z);
+
+printf('\n \n Subtrahend= 62H \n');
+printf('It is a positive no since D7= 0 for 62H. \n');
+// subtraction can be represented as
+// FAH-62H= (-06H)-(+62H)
+s=-x-z; 
+a=-s;
+d=dec2hex(a);
+printf('Subtraction= ');
+disp(s);
+disp(d);
+printf('in hexadecimal with a negative sign \n \n');
+g=bitcmp(a,8); // 1's compliment of result
+q=g+1; // 2's compliment of result
+e=dec2hex(q);
+printf('2s compliment of result would be= ');
+disp(e);