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clear
//
//
//

//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("\n percent volume change is %0.1f",(V))