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+// Example 2.1//
+d= 8.93;//g/cm^3 // density of copper
+a=63.55;//amu // atomic mass of copper
+//The volume sampled
+c=1;//mew meter //deep cylinder in the surface of solid copper
+e=2;//given
+f=1;//cm //centimeter
+g=10^4;//mew m
+vs=(%pi*(c/e)^2)*(1/10^4)^3//Volume sampled formula
+mprintf(" vs = %e cm^3",vs)
+//Thus, the number of atoms sampled
+a1=8.93;//g/cm^3
+b=0.602*10^24;//atoms//Avogadro's number
+c1=63.55;//g
+ns=a1*vs*b/c1
+mprintf("\n ns = %e atoms",ns)