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+//page no 179
+//example 6.6
+//SUBTRACTION OF TWO NUMBERS.
+//accumulator has 97H. Converting it into decimal value
+clc;
+A=hex2dec(['97']);
+//register B has 65H. Finding 2's compliment of 65H.
+B=hex2dec(['65']);
+X=256-B;
+Y=A+X;
+S=Y-256;
+Z=dec2hex(S);
+printf('Subtraction= ')
+disp(Z);
+if Y>255 then
+    CY=1;
+    printf('The result is positive. \n');
+else
+    CY=0;
+    printf('The result is negative. \n')
+end
+if S>127 then
+    printf('S=1 \n')
+else
+    printf('S=0 \n')
+end
+if S>0 then
+    printf('Z=0 \n')
+else
+    printf('Z=1 \n')
+end