1. ICE1341 Programming Languages Spring 2005 Lecture #15 Lecture #15 In-Young Ko iko.AT. icu.ac.kr iko.AT. icu.ac.kr Information and Communications University (ICU)

2. Spring 2005 2 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Chapter 8 – Statement-Level Control Structures Chapter 8 – Statement-Level Control Structures Unconditional Branching Unconditional Branching Guarded Commands Guarded Commands FORTRAN Programming FORTRAN Programming Data Types Data Types Operators Operators Last Lecture

3. Spring 2005 3 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University This Lecture FORTRAN Programming – cont. FORTRAN Programming – cont. Control Statements Control Statements Input/Output Statements Input/Output Statements Subprograms Subprograms Homework #5 – FORTRAN Programming Exercises Homework #5 – FORTRAN Programming Exercises

4. Spring 2005 4 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Program Flow Control GotoGOTO (10, 20, 30) KCOUNT GotoGOTO (10, 20, 30) KCOUNT Logical IFIF (K.LT. 1) K = K + 1 Logical IFIF (K.LT. 1) K = K + 1 Arithmetic IFIF (A / T – S) 10, 20, 30 Arithmetic IFIF (A / T – S) 10, 20, 30 Block IFIF (M.GT. 15) THEN M = M / 3 Block IFIF (M.GT. 15) THEN M = M / 3 ELSE M = M * 3 ENDIF Do loopsDO 10 I = 1, N, 2 Do loopsDO 10 I = 1, N, 2 SUM = SUM + I SUM = SUM + I 10 CONTINUE 10 CONTINUE

5. Spring 2005 5 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Data Input Standard I/O Units: stdin (5), stdout (6) Standard I/O Units: stdin (5), stdout (6) READ (5, 99) NUM, VAL, STR 99FORMAT (I3, 2X, F5.2, 1X, A20) READ (5, 98) N1, N2, N3, STR1, STR2 98FORMAT (3I5, //2A15) READ (5, *) L, SUM, NAME OPEN (UNIT=10, FILE=‘data.txt’, * STATUS=‘OLD’) * STATUS=‘OLD’) READ (10, *) N, A, X, S

6. Spring 2005 6 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Input Format Example / I6orA62X 4I 2I2I F5.1 2X 5X F5.1 5X F6.1

7. Spring 2005 7 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Data Output Carriage Control Codes: 1H1 (new page), 1H0 (double space), 1Hb (single space)… Carriage Control Codes: 1H1 (new page), 1H0 (double space), 1Hb (single space)… WRITE (6, 97) A, B, C 97FORMAT (1H1,//3F8.2) WRITE (6, 96) X, Y, SUM 96FORMAT (1H0, 4HX =, F4.1, 3X, 4HY =, * F4.1, 4X, 6HSUM =, F5.1, 20(1H*)) * F4.1, 4X, 6HSUM =, F5.1, 20(1H*)) PRINT *, ‘X = ’, X, ‘Y = ’, Y, ‘SUM = ’, SUM OPEN (UNIT=11, FILE=‘data.txt’, * STATUS=‘NEW’) * STATUS=‘NEW’) WRITE (11, *) ‘Result = ’, SUM

8. Spring 2005 8 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Subprograms - Subroutines SUBROUTINE SUMMARY(X, N, TOT) DIMENSION X(20) TOT = 0.0 DO 10 I = 1, N TOT = TOT + X(I) TOT = TOT + X(I) 10CONTINUE RETURNEND J.W. Perry Cole, ANSI FORTRAN IV, wcb All parameters are bidirectional

9. Spring 2005 9 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Subprograms - Functions FUNCTION TOTAL(X, N) DIMENSION X(20) TOTAL = 0.0 DO 10 I = 1, N TOTAL = TOTAL + X(I) TOTAL = TOTAL + X(I) 10CONTINUE RETURNEND

10. Spring 2005 10 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Subprogram Calls PROGRAM SAMPLE2 DIMENSION A(10), B(20) READ (5, 99) A 99FORMAT (10F4.2) CALL SUMMARY(A, 10, SUM) WRITE (6, 98) A, SUM 98FORMAT (1, H0, 10F7.2/, 6HSUM =, F7.2) READ (5, 99) B WRITE (6, 98) B, TOTAL(SUM, 10) STOPEND

11. Spring 2005 11 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University GNU FORTRAN77 Compiler Download G77 from: Download G77 from: http://www.geocities.com/Athens/Olympus/5564/g77.htm G77 Installation and Execution Instructions: G77 Installation and Execution Instructions: http://www.engineering.usu.edu/cee/faculty/gurro/Software_Calcul ators/Fortran_g77/GettingStartedGnuFortran.pdf http://www.engineering.usu.edu/cee/faculty/gurro/Software_Calcul ators/Fortran_g77/GettingStartedGnuFortran.pdf FORTRAN77 Tutorial: FORTRAN77 Tutorial: http://www.stanford.edu/class/me200c/tutorial_77/ FORTRAN77 Language Reference: FORTRAN77 Language Reference: http://www.ictp.trieste.it/~manuals/programming/sun/fortran/f77rm/

12. Spring 2005 12 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Homework #5 – A Weather Data Retrieval Program (1) Install G77 on your computer and practice how to compile and run FORTRAN programs Install G77 on your computer and practice how to compile and run FORTRAN programs Download a weather data file that contains the latest week’s weather information from: ftp://ftp.ncdc.noaa.gov/pub/data/globalsod/data.txt Download a weather data file that contains the latest week’s weather information from: ftp://ftp.ncdc.noaa.gov/pub/data/globalsod/data.txt ftp://ftp.ncdc.noaa.gov/pub/data/globalsod/data.txt Download the weather station list from: ftp://ftp.ncdc.noaa.gov/pub/data/globalsod/stnlist-sorted.txt Download the weather station list from: ftp://ftp.ncdc.noaa.gov/pub/data/globalsod/stnlist-sorted.txt ftp://ftp.ncdc.noaa.gov/pub/data/globalsod/stnlist-sorted.txt Check the weather data file format from: ftp://ftp.ncdc.noaa.gov/pub/data/globalsod/README.TXT Check the weather data file format from: ftp://ftp.ncdc.noaa.gov/pub/data/globalsod/README.TXT ftp://ftp.ncdc.noaa.gov/pub/data/globalsod/README.TXT

13. Spring 2005 13 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Homework #5 – A Weather Data Retrieval Program (2) Weather Data File Weather Data File Format

14. Spring 2005 14 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Homework #5 – A Weather Data Retrieval Program (3) Weather Station List 471330 RKTF DAEJEON KO +3636 +12740 +0072

15. Spring 2005 15 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Homework #5 – A Weather Data Retrieval Program (4) Programming Exercise #1: Programming Exercise #1: Write a FORTRAN program that accepts a city name (e.g., DAEJEON, SEOUL, PARIS), and prints the lowest and highest temperatures (in Celsius), and sea-level pressure values for the latest week like: City: DAEJEON DateMINMAXSLP 200503289.515.21002.7 2005032912.320.11005.1 …

16. Spring 2005 16 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Homework #5 – A Weather Data Retrieval Program (5) Programming Exercise #2 (Extra-credit): Programming Exercise #2 (Extra-credit): Assume that you are traveling with a PDA with a GPS device. Please write a FORTRAN program that finds a city name base on the lat/long data received from the GPS device (keyboard inputs for this exercise), and prints the latest weather information of the place: Lat: +36.36, Long: +12.740 City: DAEJEON DateMINMAXSLP 200504259.515.21002.7

17. Spring 2005 17 ICE 1341 – Programming Languages © In-Young Ko, Information and Communications University Homework #5 – A Weather Data Retrieval Program (6) To retrieve weather information for a city, use the weather station number that is firstly matched against the city name in the station list To retrieve weather information for a city, use the weather station number that is firstly matched against the city name in the station list Use INDEX function to match a city name from the station list Use INDEX function to match a city name from the station list IF (INDEX(NAME, ‘ICU’).GT. 0) PRINT *, ‘Matched!’ PRINT *, ‘Matched!’ Submit the source program electronically (to TA) by Midnight of Wednesday May 4, 2005 Submit the source program electronically (to TA) by Midnight of Wednesday May 4, 2005 Please do not collaborate with other students! Please do not collaborate with other students!