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diff --git a/1871/CH8/EX8.7/Ch08Ex7.sce b/1871/CH8/EX8.7/Ch08Ex7.sce
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+// Scilab code Ex8.7 : Pg:333(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   
+
+sub = 1000;    // Initialize the first binary number
+men = 0001;    // Initialize the second binary number
+
+printf("%4d - 000%1d = 0%3d", sub, men, decimal_binary(binary_decimal(sub)-binary_decimal(men))); 
+
+// Result
+// 1000 - 0001 = 0111