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+//pagenumber 99 example 1
+clear
+q=0.01;//centimetre
+sigma1=1;//ohm centimetre inverse
+q1=0.01;//centimetre
+sigm11=0.01;//ohm centimetre inverse
+iratio=(0.0224^2*2.11*20)*3.6^2/((3.11*(4.3^2*10^-6)^2*2.6*20*10^3));
+for q=1:2
+    if q==1 then
+        un=3800;
+        up=1500;
+        q=1.6*10^-19;
+        ni=2.5*10;
+    else
+        q=1.6*10^-19;
+        up=500
+        un=1300;
+        ni=1.5*10
+end
+    
+    b=un/up;
+    sigmai=(un+up)*q*ni;
+end
+disp("ratio of reverse saturation current   =   "+string((iratio)));//correction in the book
+
+
+
+
+