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diff --git a/226/CH5/EX5.18/example18_sce.sce b/226/CH5/EX5.18/example18_sce.sce
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+++ b/226/CH5/EX5.18/example18_sce.sce
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+//chapter 5
+//example 5.18
+//page 221
+printf("\n")
+printf("given")
+Icbo1=15*10^-9;// at 25C
+S=101;
+disp("chnage in temp")
+T=105-25
+disp(" n=T in 10 step")
+n=T/10
+Icbo2=Icbo1*2^n
+Icbo=Icbo2-Icbo1
+disp(" for base bais")
+Ic=S*Icbo
+disp("  for collector to base bais")
+S=56;
+Ic=S*Icbo
+disp(" for voltage divider bais")
+S=8.2;
+Ic=S*Icbo
+\ No newline at end of file