Calling all Programers

[wiccanmouse]

Anyone code in fortran? I'm confused by if statements and lacking a reference text for a few weeks:

IF(TIM-TE1)11,11,13
   11    DE1=0.0*1.0
         GO TO 55
   13    DE1=(DE/(TE2-TE1))*(TIM-TE1)

Thanks