//variable declaration
h=6.626*10**-34              //Planck constant 
C=3*10**8                    //Velocity of light
E_g=1.44                     //bandgap 

//calculations
lamda=(h*C)*10**10/(E_g*1.6*10**-19)       //Wavelenght

//Result
printf('Wavelenght = %0.3f   Angstrom     \n',(lamda))