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////Given
m=9.1*10**-31 //Kg
h=1.05*10**-34 //Js
ev=1.6*10**-19
n1=1
n2=2
n3=3
a=10**-10 //m
//Calculation
//
E1=((n1**2*%pi**2*h**2)/(8.0*m*a**2))/(1.6*10**-19) //ev
E2=n2**2*E1
E3=n3**2*E1
//Result
printf("\n \n three lowest energy levels are %0.1f ev %0.1f ev and %0.2f ev",E1,E2,E3)
printf("\n their eigenfunctions are 1/10**-5*cos(pie*x/2*10**-10),1/10**-5*sin(pie*x/10**-10) and 1/10**-5*cos(3*pie*x/2*10**-10)")
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