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clear
//
//
//

//Variable declaration
c=3*10**8                 //velocity of light(m/s)
h=6.63*10**-34            //plank's constant(Js)
e=1.6*10**-19             //charge(coulomb)
Eg=1.44*e                 //band gap(eV)   

//Calculation
lamda=h*c*10**10/Eg       //wavelength(angstrom)

//Result
printf("\n wavelength is %0.0f  angstrom",lamda)