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// Scilab code Ex8.11 : Pg:336(2008)
clc;clear;
function [bini]= decimal_binary(ni) // Function to convert decimal to binary
bini = 0;
i = 1;
while (ni <> 0)
rem = ni-fix(ni./2).*2;
ni = int(ni/2);
bini = bini + rem*i;
i = i * 10;
end
endfunction
function [deci]= binary_decimal(ni) // Function to convert binary to decimal
deci = 0;
i = 0;
while (ni <> 0)
rem = ni-fix(ni./10).*10;
ni = int(ni/10);
deci = deci + rem*2.^i;
i = i + 1;
end
endfunction
// Function to convert a vector with binary elements to a binary number
function vtob = vector_to_bin(vector)
cnt = 1; vtob = 0;
for i = 1:1:length(vector)
vtob = vtob + vector(i)*cnt;
cnt = cnt*10;
end
endfunction
function bin_cmp = ones_cmp(bin) // Function to perform ones complement
binc = zeros(5);
i = 1;
while(i <= 5)
rem = bin-fix(bin./10).*10;
if rem == 1 then
rem = 0;
else
rem = 1;
end
bin = int(bin/10);
binc(i)=rem;
i = i+1;
end
bin_cmp = vector_to_bin(binc);
endfunction
function plus_one_res = twos_cmp(r) // Function to perform twos complement
onec = zeros(5);
i = 1;
while(i <= 5)
rem = r-fix(r./10).*10;
r = int(r/10);
onec(i)=rem;
i = i+1;
end
plus_one_res = vector_to_bin(binc);
plus_one_res = binary_decimal(plus_one_res)+1;
endfunction
function fr = check_result(res) // Function to check the occurence of end-around carry
max_result = 11111;
if binary_decimal(res) > binary_decimal(max_result) then
fr = decimal_binary(twos_cmp(res));
else
fr = ones_cmp(res);
end
endfunction
sub = 01101; // Initialize the first binary number
men = 11011; // Initialize the second binary number
result = decimal_binary(binary_decimal(sub)+binary_decimal(ones_cmp(men)));
final_result = check_result(result);
printf("0%4d - %5d = -0%4d", sub, men, final_result);
// Result
// 01101 - 11011 = -01110
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