Three languages:

• Fortran: 1957. Designed to be fast.
• Lisp: 1958. Designed to be pure.
• Cobol: 1959. Common Business-Oriented Language.

Fortran

program add

implicit none

integer a,b,sum
read *, a,b
sum = a + b
print *,''
print *, ' The sum of ', a,' and ' , b, ' is ' , sum,'.'
print *,''
print *,'End of Program'
end program

Lisp

(defun add ()
  (flet ((prompt (string)
                 (format t "~&~a: " string)
                 (finish-output)
                 (read nil 'eof nil)))
    (let ((x (prompt "first number"))
          (y (prompt "second number"))
          )
      (format t "~a" (+ x y)))))

COBOL

    $ SET SOURCEFORMAT"FREE"
    IDENTIFICATION DIVISION.
    PROGRAM-ID.  Iteration-If.
    AUTHOR.  Michael Coughlan.

    DATA DIVISION.
    WORKING-STORAGE SECTION.
    01  Num1           PIC 9  VALUE ZEROS.
    01  Num2           PIC 9  VALUE ZEROS.
    01  Result         PIC 99 VALUE ZEROS.
    01  Operator       PIC X  VALUE SPACE.

    PROCEDURE DIVISION.
    Calculator.
    PERFORM 3 TIMES
    DISPLAY "Enter First Number      : " WITH NO ADVANCING
    ACCEPT Num1
    DISPLAY "Enter Second Number     : " WITH NO ADVANCING
    ACCEPT Num2
    DISPLAY "Enter operator (+ or *) : " WITH NO ADVANCING
    ACCEPT Operator
    IF Operator = "+" THEN
    ADD Num1, Num2 GIVING Result
    END-IF
    IF Operator = "*" THEN
    MULTIPLY Num1 BY Num2 GIVING Result
    END-IF
    DISPLAY "Result is = ", Result
    END-PERFORM.
    STOP RUN.

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