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+//CHAPTER 4_ Motion and Dimensional Measurement
+//Caption : Resistance strain gage
+// Example 1// Page 163
+
+disp("Rg=120")
+disp("E=200 *10^9")
+disp("dL=3 ")
+disp("dp=0.3")
+disp("v=0.3 ")
+Rg=120   //('enter the resistance of strain gage=:')
+E=200 *10^9   // given
+dL=3  //('enter the percent change in the length of nthe rod due to loading=:')
+dp=0.3  //('enter the corresponding change in the resistivity of strain gage=:')
+v=0.3   // poissons ratio
+e=dL/100;
+dp_p=dp/100
+disp("dR_R=dp_p+e*(1+2*v)")
+dR_R=dp_p+e*(1+2*v)
+Sg=dR_R/e;
+printf('So the gage factor is %fd \n',Sg)
+u_dr=0.02   //('enter the uncertainty in resistance=:')
+u_sig=E*u_dr/(Rg*Sg)*10^-6;
+printf(' Stress uncertainty is %1.1f MPa\n',u_sig)
+// To calculate strain uncertainty
+u_e=u_dr/(Rg*Sg)
+printf('Strain uncertainty is %fd\n',u_e)