Early Type Systems: FORTRAN

(This is Fortran 77, but early Fortran was similar.)

INTEGER
- INTEGER*2, INTEGER*4, INTEGER*8
LOGICAL (Fortran jargon for `boolean')
- LOGICAL*1 (synonym: BYTE), LOGICAL*2, LOGICAL*4, LOGICAL*8
REAL
- REAL*4, REAL*8 (synonym: DOUBLE PRECISION), REAL*16
COMPLEX
- COMPLEX*8, COMPLEX*16 (synonym: DOUBLE COMPLEX), COMPLEX*32

Now if you write

        INTEGER I
        REAL R,S

        R = I + S

the compiler can automatically generate the correct instructions