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+//===========================================================================
+//chapter 3 example 20
+
+clc;clear all;
+
+//variable declaration
+R    = 100;      //resistance in  Ω
+dR   = 5;       // error (dR/R) in %
+L   = 2;      //inductance 
+r     = 50;
+dL   = 10;       // error (dl/L) in %
+
+//calculations
+u    = R**2;      
+du    = 2*dR;     //percentage error(du/u) in %
+v     = ((2*(%pi)*(r))**2)*(L**2); 
+dv    =2*dL;     //percentage error(dv/v) in %
+x     = u+v;
+dx    =((u/(x))*(du))+((v/(x))*(dv));    //percentage error(dx/x)in %
+Z     = sqrt(x);
+dZ    = dx/(2);         //uncertanity (dZ/Z) in %
+
+//result
+mprintf("uncertanity in the measurement = %3.3f percentage",dZ);