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clc
clear
disp("Example 8.30b")
printf("\n")
disp("perform the following decimal subtraction using 10s complements")
disp("a)49-24 b)321-578")
//given numbers
a=49
b=-24
//should set to 100 if input is 2 digit number,1000 if 3digit number
c=1000
//add c with 2nd operand
e=c+b
N=a+e
if(N>100)
if(N<199)
M=N-100
N=M
end
end
if(N>1000)
if(N<1999)
M=N-1000
N=M
end
end
M=N
if(-b>a)
M=-(999-M+1)
end
printf("result=%d",M)
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