Part 1 (60 marks) Write a Fortran program that reads a number from the keyboard

Question

Part 1 (60 marks) Write a Fortran program that reads a number from the keyboard and then outputs a message indicating whether or not the number is abundant. If the input is 24, the output should be: The number 24 is abundant If the input is 29, the output should be: The number 29 is not abundant Part 2 (40 marks) The smallest abundant number that is odd (not divisible by 2) is 945. Write a Fortran program that prints the value of the all odd abundant numbers less than 5000. Your program must include a loop that checks each number less than 5000 to determine whether or not it is abundant and also odd. The program for part 2 must have a loop that checks a sequence of numbers. That is you must not just hardcode the solution

Explanation / Answer

follow this FORMAT DESCRIPTORS - The elements in the I/O list must agree in TYPE with the FORMAT DESCRIPTOR being used. - There are a dozen or so descriptors, The most commonly used are: Descriptor Use rIw Integer data rFw.d Real data in decimal notation rEw.d Real data in scientific notation Aw Character data 'x...x' Character strings nX Horizontal spacing (skip spaces) / Vertical spacing (skip lines) Tc Tab Where: w = positive integer specifying FIELD WIDTH r = positive integer REPEAT COUNT d = non-negative integer specifying number of digits to display to right of decimal. x = any character n = positive integer specifying number of columns c = positive integer representing column number NOTES ON DESCRIPTORS: - Values for I, F, and E descriptors will be right justified. - You must leave enough space for negative sign in the field width for I, E, F, and for decimal point for E, F and for exponent for E. - When using the E descriptor, the number will be NORMALIZED. This means the number is shifted over so that the first digit is in the tenths position. A leading zero and decimal are always present and a minus sign, if needed. The exponent always requires 4 spaces; E, the sign and 2 digits. - If you overflow the space allotted to a descriptor, it will print out asterisks (at RUN TIME) in the field space. - Character data (A) is also right-justified but if it overflows the allotted space it is left-most truncated. - The first character of each line of output is used to control the vertical spacing. Use 1X to give normal spacing. MORE COMPLICATED EXAMPLES: 1. Format identifier Given: REAL ROOT1, ROOT2 1. Unformatted or "free format" output: All three are equivalent Print*, root1, root2 Write (6,*) root1, root2 Write (6,*) 'Roots are:' root1, root2 2. Formatted write statements: Write (6,100) root1, root2 100 format (1x, 'The Roots Are: ', F5.1,1x,F5.1) output: The Roots Are: 123.5 789.1 3. Write(6,'(',The Roots Are: ', 2F5.1)') root1,root2   4. Define character*5 FRMT FRMT = '2F5.1' write(6,FRMT) root1, root2 2. Format Descriptors Integer: Iw examples: NUM1 = 123, NUM2 = 456, NUM3 =9 write(6,15) NUM1, NUM2, NUM3 15 format (1x,I3,1x,I3,1x,I3) output: 123 456 9 ^ ^ ^^^ write(6,18) NUM1, NUM2, NUM3 18 format (1x,3(I2,1x)) output: *** *** *** Note: If the number is too large ^ ^ ^^ for #spaces allotted, *** are printed. Reals: REAL NUMBER1, NUMBER2 NUMBER1 = -123.5678 NUMBER2 = -23456.89 A. F format (decimal) Fw.d d=# places to right of decimal w-d > or = 2 (to include the decimal pt and +/- sign) NUMBER1 needs format F9.4 NUMBER2 needs format F9.2 B. E format -- good for 1) large or small numbers 2) don't know the size of number Ew.d w - d > or = 7: need at least 7 places for: e-03 -- 4 places +/- -- 1 place 0. -- 2 places NUMBER1 needs format E14.7 -0.1235678E+03 NUMBER2 need foprmat E14.7 -0.2345689E+05 C. G-format G10,3 chooses between E & F format depending on the size of the number D. D-format Dw.d same as E, but for Double Precision D10.3 1.473D-05 Character Variables: CHARACTER*10 NAME REAL SCORE1, SCORE2 A-format Aw w = # characters read(10,100) NAME, SCORE1, SCORE2 100 format(A10,1x,f6.1,1x,f6.2) read this one line from input file, unit=10 JORDAN____ __98.4 __75.5 write(20,150) NAME 150 format(1x,'Last name = ', A10) output file (unit=20) line is: Last name = JORDAN____ writes out left justified If we write NAME in A5 format Last name = JORDA truncated: not enough characters * When reading in "free format" for a character string, your input needs single quotes around it. read*, name keyboard input: 'JORDAN' * When reading a character string using a format statement, you do not need the single quotes. read(*,50) name 50 format(A10) keyboard input: JORDAN no quotes!! 3. Control of Horizontal Spacing. 1. nX skips n spaces read (10,150) INTEGER1, INTEGER2 150 format (I3, 12x, I3) skips everything in between 2. Tabs! Tc c = column number Great for tables!! format (1x, F7.2, T12, F7.1, T24, I6)  starts in Column 12 4. File Types: Sequential: lines of data or records are written in a sequence and must be read in that (Chapter 11) sequence. If you want to ignore 4 lines and then read 5th line . . . Must READ all 4 lines first, then start with 5th line. NO WAY TO SKIP to 5th line. Direct-access files: Records have specified Record Length (RECL). Each record can be accessed individually You can skip to the 5th record. 5. Open Statements p.518 Open (unit=10, file='mydata', status='old') status = old, new, unknown You can use a character variable name, for example: character*30 file1 file1= '/home/usr6/mr2020/lab4.data' open (unit=10, file=file1, status='old', readonly) The readonly option will not allow you to write to unit=10. This protects your file from accidentally being overwritten. To write to files: open(unit=20,file='Lab4.output',status='new') If status='new' and then you rerun the program, the file Lab4.output already exists from the last time you ran the program, so the program stops!

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.