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//Example number 3.11, Page number 50

clc;clear;
close;

//Variable declaration
r1=1.258*10**-10;     //radius(m)
r2=1.292*10**-10;     //radius(m)
//Calculation
a_bcc=4*r1/sqrt(3);
v=a_bcc**3;
V1=v/2;
a_fcc=2*sqrt(2)*r2;
V2=a_fcc**3/4;
V=(V1-V2)*100/V1;           //percent volume change is",V,"%"
//Result
printf("percent volume change is %.1f %%",V)