Computer History - Herong's Notes - Version 3.11, by Dr. Herong Yang
FORTRAN 77 - Example Program Code
This section provides a simple example program code of FORTRAN 77 language.
In FORTRAN 77, several interesting features were added to FORTRAN 66:
Here is a simple example code of FORTRAN 77 that calculates the area of triangles using Heron's formula:
C AREA OF A TRIANGLE - HERON'S FORMULA C INPUT - CARD READER UNIT 5, INTEGER INPUT C OUTPUT - LINE PRINTER UNIT 6, REAL OUTPUT C INPUT ERROR DISPAYS ERROR MESSAGE ON OUTPUT PROGRAM AREA INTEGER A, B, C CHARACTER MSGEND*40, MSGERR*40 MSGEND = "NORMAL END" STRERR = "INPUT ERROR" 100 READ(5,10,END=200,ERR=300) A,B,C 10 FORMAT(3I5) IF(A=0 .OR. B=0 .OR. C=0) THEN WRITE(6,*) "Zero value not allowed" ELSE S = (A + B + C) / 2.0 AREA = SQRT( S * (S - A) * (S - B) * (S - C)) WRITE(6,601) A,B,C,AREA 20 FORMAT(" A=",I5,", B=",I5,", C=",I5,", AREA=", * F10.2," SQUARE UNITS") END IF GO TO 100 200 WRITE(6,*) MSGEND STOP 300 WRITE(6,*) MSGERR STOP END
Table of Contents
►1957 - FORTRAN Language Developed by IBM
Storing FORTRAN Program Code on Punch Cards
FORTRAN 66 - Example Program Code
►FORTRAN 77 - Example Program Code
g77 - GNU Project FORTRAN Compiler
Fortran 90 - Example Program Code
1970 - UNIX Operating System Developed by AT&T Bell Labs
1971 - FTP Protocol Created by Abhay Bhushan
1972 - C Language Developed by Dennis Ritchie
1976 - vi Text Editor Developed by Bill Joy
1977 - Apple II Designed by Steve Jobs and Steve Wozniak
1977 - The Bourne Shell Developed by Stephen Bourne
1978 - The C Shell Developed by Bill Joy
1978 - Bash (Bourne-Again Shell) Developed by Brian Fox
1979 - The Tcsh (TENEX C Shell) Developed by Ken Greer
1983 - "Sendmail" Mail Transfer Agent Developed by Eric Allman
1984 - Macintosh Developed by Apple Inc.
1984 - X Window System Developed a MIT Team
1991 - WWW (World Wide Web) Developed by Tim Berners-Lee
1991 - Gopher Protocol Created by a University of Minnesota Team
1995 - Java Language Developed by Sun Microsystems
1995 - PHP: Hypertext Preprocessor Created by Rasmus Lerdorf