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+//example-17.4
+//page no-526
+//given
+//one mole of magnesium weighs
+MMg=0.0243  //Kg
+//current density
+I=20*10^-3   //A/m^2
+//design life of 15 years
+t=15*365*24*3600  //sec
+//charge= 2 faradya
+Q=2*96490  //C
+//charge needed per m^2 of structure's for design life
+q=I*t  //A s
+//the amount of magnesium needed
+AMg=MMg*q/Q  //kg/m^2
+printf("the amount of magnesiun meeded is %f kg/m?^2",AMg)