Fortran.

Compilation and Fibonacci simulations.

FORTRAN · 01

The compiler’s path

01 / 02 · TAP A BOX TO INSPECT IT

Show the object program as

Punched cards

Tape · drum · disk

Printed for inspection

STEP 1 · INPUT

FORTRAN source code is human-readable. The compiler translates it into instructions the computer can execute.

FORTRAN · 02

02 / 02 · STEP THROUGH THE LOOP

Fibonacci terms Ready at the starting values.

TRUE

FALSE

READY · START

Start with NEXT = 0 and LATEST = 1. Add the pair; if SUM ≤ 1,000, shift the values and repeat.

NEXT = 0LATEST = 1SUM = —STEP = 0