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+//Example 3.4//
+a=24.31;//gram //atomic mass of magnesium
+b=16.00;//gram // atomic mass of oxygen
+c=0.6023*10^24;//Avogardo's number
+v=0.0741;//nm^3 //unit cell volume
+d=10^7;//nm/cm
+e=4;//Number of electrons
+p=((((e*a)+(e*b))/(c))/(v))*d^3
+mprintf("p = %f g/cm^3",p)