CS : Programming for Non-Majors, Summer 2007 Programming Project #3: Two Little Calculations Due by 12:00pm (noon) Wednesday June

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1 CS : Programmig for No-Majors, Summer 2007 Programmig Project #3: Two Little Calculatios Due by 12:00pm (oo) Wedesday Jue This third assigmet will give you experiece writig programs that ivolve arithmetic expressios. You will write two short programs. Each program will greet the user, prompt for ad iput data from the user, perform oe or more calculatios, ad output the result(s) to the user. Therefore, each program body will have a greetig subsectio, a iput subsectio, a calculatio subsectio, ad a output subsectio. This project will use the same developmet process as i Programmig Project #2, ad will be subject to the same rules ad gradig criteria, plus some additioal criteria. YOU ARE EXPECTED TO KNOW HOW TO DO MANY OF THESE TASKS WITHOUT HAVING THEM DESCRIBED IN DETAIL. The two programs will ivolve: covertig measuremets from Eglish to metric uits ad calculatig statistics. Put each of the two programs i a separate source file; you MUST ame them: I. WHAT TO DO FIRST coversios.c statistics.c At the top of your makefile, add etries that looks like these: coversios: coversios.c gcc -o coversios coversios.c -lm statistics: statistics.c gcc -o statistics statistics.c -lm (Note the -lm, which is to say hyphe ell em, at the ed of each gcc commad.) DON T DELETE PREVIOUS makefile ENTRIES! II. CODE DEVELOPMENT PROCESS The process for developig these programs will be the same as described i the PP#2 specificatio, o page 4 i the sectio titled Advice o How to Write a Program. Pay close attetio to the last umbered list o that page. The oly differece betwee the task list for PP#2 ad the process that you will use for PP#3 will be that the two programs i PP#3 will have calculatios, which the program i PP#2 did ot. You should follow the directios i the PP#2 specificatio EXACTLY, igorig the calculatio subsectio util you have completed the rest of the program. (At this stage, some of the outputs i the output subsectio will be garbage.) Oce everythig except the calculatio subsectio is writte ad seems to be workig properly, you should the create the calculatio subsectio. NOTE THAT YOU WILL WRITE EACH PROGRAM OUT OF ORDER, CREATING THE CALCULATION SUBSECTION LAST, EVEN THOUGH IT IS IN THE MIDDLE OF THE PROGRAM BODY. O the followig pages are the specificatios of the two programs that you will write. 1

2 III. CONVERSIONS Accordig to the Mars Climate Orbiter Mishap Ivestigatio Board Phase I Report (Nov ),... The MCO... was lost sometime followig the spacecraft s etry ito Mars occultatio... [T]he root cause for the loss... was the failure to use metric uits i the codig of... software... used i trajectory models. Specifically, thruster performace data i Eglish uits istead of metric uits was used i the software applicatio code titled SM FORCES (small forces). A file called Agular Mometum Desaturatio (AMD) cotaied the output data from the SM FORCES software. The data i the AMD file was required to be i metric uits... ad the trajectory modelers assumed the data was provided i metric uits per the requiremets.... Write a program to covert from Eglish uits to metric uits, specifically to covert altitude from feet to kilometers, ad to covert fuel bur rate from gallos per hour to milliliters per secod. For your coversios, use the followig costat values AND NO OTHERS, declarig ad iitializig appropriate amed costats (you may NOT combie these i iitializatios): There are 5280 feet per mile. There are kilometers per mile. There are liters per U.S. gallo. There are 1000 milliliters per liter. There are 60 miutes per hour. There are 60 secods per miute. The program body MUST icorporate the followig subsectios, i the followig order: 1. Greetig Subsectio: Greet the user with useful iformatio about the program. 2. Iput Subsectio (a) Prompt the user for a altitude i feet. (b) Iput the altitude i feet. (c) Prompt the user for a fuel bur rate i gallos per hour. (d) Iput the fuel bur rate i gallos per hour. 3. Calculatio Subsectio (a) Calculate the altitude i kilometers. (b) Calculate the fuel bur rate i milliliters per secod. 4. Output Subsectio (a) Output the eergy altitude i both feet ad kilometers. (b) Output the fuel bur rate i both gallos per hour ad milliliters per secod. IMPORTANT: Altitudes ad fuel bur rates AREN T costraied to be itegers. RUNS: Ru this program three times usig three differet sets of iput values. The first ru MUST use 10,000 feet ad 100 gallos per hour as iput values. For the other two rus, you may choose APPROPRIATE values to your likig. 2

3 IV. STATISTICS Cosider a list of real umbers: x 1, x 2,..., x The power mea of the values i the list, here deoted M p for some real umber p, is a real umber such that ( i=1 x p ) 1 ( p i x p 1 + x p x p ) 1 p M p (x 1, x 2,, x ) = = Note: i=1 z i is kow as summatio otatio: i=1 z i = z 1 + z z Example #1: The arithmetic mea, also kow simply as the mea, which is the power mea with p of 1, is a real umber that is a average; that is, a value that is typical of the values i the list. The arithmetic mea, here deoted x (proouced x-bar ), is calculated as the sum of all the values i the list, divided by the umber of values i the list: i=1 x i x = M 1 (x 1, x 2,, x ) = = x 1 + x x Example #2: The root mea square, deoted R(x), is the power mea with p of 2: ( i=1 x 2 ) 1 2 i R(x 1, x 2,, x ) = M 2 (x 1, x 2,, x ) = = x x x 2 Example #3: The harmoic mea, deoted H(x), is the power mea with p of -1: ( i=1 x 1 ) 1 i H(x 1, x 2,, x ) = M 1 (x 1, x 2,, x ) = = 1 x x x Write a program to calculate the statistics described above, for a list of 5 umbers. The program MUST icorporate the followig subsectios, i the followig order: 1. Greetig Subsectio: Greet the user with useful iformatio about the program. 2. Iput Subsectio (a) Prompt the user to iput 5 values. (b) Iput the 5 values, usig a sigle scaf statemet. 3. Calculatio Subsectio (a) Calculate the arithmetic mea of the 5 values. (b) Calculate the root mea square of the 5 values. (c) Calculate the harmoic mea of the 5 values. 4. Output Subsectio (a) Output the 5 values. (b) Output their arithmetic mea. (c) Output their root mea square. (d) Output their harmoic mea

4 You may use the C math library fuctio sqrt for square root. To use the sqrt fuctio, you MUST first do this: immediately after the usual preprocessor directive #iclude <stdio.h> you MUST have aother preprocessor directive: #iclude <math.h> The, to use the math library fuctio sqrt, do this: y = sqrt(x); for some variables x ad y (though of course i your program the variables will have differet ames tha these). Note that the equivalet i mathematics is y = x Fially, the compile commad i your makefile etry for the program MUST ed with -lm (that is, hyphe ell em, NOT hyphe oe em), as show i the makefile etries at the begiig of this documet. NOTE: You may NOT use x, x bar, R, H, etc., as variable ames, because they would violate the favorite professor rule. IMPORTANT: Statistics are almost always o-itegers. RUNS: Ru this program three times usig three differet sets of iput values. The first ru MUST use the followig five iput values: For the other two rus, you may choose APPROPRIATE values to your likig. 4

5 VI. ADDITIONAL GRADING CRITERIA The followig gradig criteria will apply to ALL CS1313 programmig projects, uless explicitly stated otherwise. Additioal Gradig Criteria for C Source Code 1. Declaratio subsectios: Withi the declaratio sectio, there MUST be a subsectio of amed costat declaratios, followed by a subsectio of variable declaratios. These two declaratio subsectios MUST be clearly labeled, as show i my umber.c. 2. Declaratio subsectio order: The amed costat declaratio subsectio MUST appear BEFORE the variable declaratio subsectio, ad therefore ALL amed costat declaratios MUST appear before ANY variable declaratios, as show i my umber.c. 3. Named costat declaratio order: ALL float amed costats MUST be declared before ANY it amed costats. Likewise, ALL float variables MUST be declared before ANY it variables. 4. Named costat declaratio commets: Named costat ad variable declaratios MUST be preceded by commets clearly explaiig the ature ad purpose of each declared ame, as show i my umber.c. 5. No mixig of sectios ad subsectios: You are ABSOLUTELY FORBIDDEN to have: ANY declaratios i your program body; ANY iputs or calculatios i your greetig subsectio; ANY calculatios, or outputs other tha prompts, i your iput subsectio; ANY iputs or outputs i your calculatio subsectio; ANY iputs or calculatios i your output subsectio. 6. Numeric literal costats are ABSOLUTELY FORBIDDEN i a program s executio sectio (body). (They are permitted i the declaratio sectio whe iitializig variables ad amed costats.) All umeric costats used i the program body MUST be amed costats. There are NO EXCEPTIONS to this rule. 7. Numeric literal costats embedded iside strig literals are also ABSOLUTELY FORBIDDEN i the program body; for example, the statemet below is NOT acceptable: pritf("this is the year 2007.\"); The oly exceptio to this rule is the use of amed costats i placeholders, which you are ot expected to use for this project. 8. Costat ames, like variable ames, MUST be meaigful, ad MUST satisfy the favorite professor rule. 9. Costat ames that reflect the value of the costat, rather tha its purpose, are ABSOLUTELY FORBIDDEN (for example, zero ad two are ot acceptable for costat ames). 10. Assigmet statemets MUST have the followig format: idetatio, followed by the ame of the variable whose value is beig assiged, followed by a blak space, followed by a sigle equals sig, followed by a blak space, followed by the expressio to calculate the variable s value. 5

6 11. Expressios i assigmet statemets MUST have the followig format: (a) Each operator (for example, + - * /) MUST be surrouded o each side by oe or more blak spaces. (b) A ope parethesis MUSTN T have ay blak spaces to its right. (c) A close parethesis MUSTN T have ay blak spaces to its left. (d) If a expressio requires multiple lies of source code text, the each lie (other tha the last) MUST ed with a operator (or the equals sig), ad correspodig parts of the expressio MUST lie up. For example: arithmetic_mea = (iput_value1 + iput_value2 + iput_value3 + iput_value4 + iput_value5) / umber_of_values; Additioal Gradig Criteria for Summary Essays You will eed to write TWO SUMMARY ESSAYS, oe for EACH of the two programs. Together, they will be worth at least 10% of the project s total value, ad each MUST cover the poits listed i the specificatio for Programmig Project #1. For this project, each of the two summary essays MUST be at least half a page sigle spaced or a full page double spaced, i a 12 poit fot, with margis of 0.75 to 1.25 iches o a side. VII. SCRIPTS Before creatig ay of your two script files, thoroughly test ad debug all of your programs. Be sure to test them with the iput values that you will be required to use i your script files. To esure that they are producig the correct results, calculate the correct results by had, ad compare your had-calculated values to the associated program output. As you develop your programs, you will compile, ru, test ad the script each of these programs separately, usig the scriptig process described i Programmig Project #1. You will create two separate script files, oe for each of the two programs. You are ABSOLUTELY FORBIDDEN to use a sigle script file for all two programs. The script files MUST be amed: pp3 coversios.txt pp3 statistics.txt VIII. WHAT TO SUBMIT Submit materials boud i the followig order: cover page, coversios summary, coversios script file, statistics summary, statistics script file, NOTE that you will have ONLY ONE COVER PAGE. If you have difficulty bidig together so may pages, it is recommeded either to use a large black bider clip. You will also eed to UPLOAD all two source files to the Desire2Lear dropbox. For this project, you are ot required to iclude idiotproofig checks o the iput, because we have ot yet leared if statemets. Future programmig projects will iclude idiotproofig. It is YOUR resposibility to read ad comply with all of the gradig criteria listed for Programmig Projects #1 ad #2, as well as the additioal criteria for this project. 6