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+//Example number 5.7, Page number 87
+
+clc;clear;
+close;
+
+//Variable declaration
+a=1*10**-10;    //length(m)
+n2=2;
+n3=3;
+m=9.1*10**-31;    //mass(kg)
+e=1.6*10**-19;    //charge(c)
+h=6.626*10**-34;   //plank constant
+//Calculation
+E1=h**2/(8*m*e*a**2);
+E2=n2**2*E1;      //energy of 1st excited state(eV)
+E3=n3**2*E1;      //energy of 2nd excited state(eV)
+//Result
+printf("ground state energy is %.2f eV",E1)
+printf("\n energy of 1st excited state is %.2f eV",E2)
+printf("\n energy of 2nd excited state is %.2f eV",E3)
+//answer in the book varies due to rounding off errors