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--- haas:fall2019:c4eng:projects:mtf1 [2019/09/22 19:05] – [Sample run using addition] wedge
+++ haas:fall2019:c4eng:projects:mtf1 [2019/10/01 12:07] (current) – [Specifications] wedge
@@ Line 13: / Line 13: @@
 =====Program=====
-It is your task to enhance the program you wrote last week (**mtf0**) that will use loops and other programming concepts learned this far to automate the display of entire mathematical operation tables (addition, subtraction, multiplication, or division; as indicated by the user). This information is potentially of value to some of your letter division efforts in the pctX projects.
+It is your task to enhance the program you wrote last week (**mtf0**) that will use loops and other programming concepts learned this far to automate the display of entire mathematical operation tables (addition, subtraction, multiplication, division, or remainder; as indicated by the user). This information is potentially of value to some of your letter division efforts in the pctX projects.
+=====Specifications=====
 Your program should:
   * have valid, descriptive variable names of length //no shorter than// 4 symbols
-  * prompt the user for the operation ('+' for addition, '-' for subtraction, '*' for multiplication, and '/' for division)
+    * I will make an exception for the use of 'row'
-    * properly store this in a variable of type (signed) **char**
+  * prompt the user for the operation ('+' for addition, '-' for subtraction, '*' for multiplication, '/' for division, and '%' for remainder)
-    * check for a literal '+', '-', '*', or '/' symbol to determine operation to perform
+    * properly store this in a variable of type **char**
-      * if invalid input, display an error and exit with a non-zero value
+    * check for a literal '+', '-', '*', '/', or '%' symbol to determine operation to perform
+      * if invalid input, display an error and exit with a non-zero value of 1
   * prompt for the starting row (0-9)
-    * properly store this in a variable of type **unsigned short int**
+    * properly store this in a variable of type **unsigned char**
-  * prompt for the endisg row (0-9)
+  * prompt for the ending row (0-9)
-    * properly store this in a variable of type **unsigned short int**
+    * properly store this in a variable of type **unsigned char**
   * prompt for the starting column (0-9)
-    * properly store this in a variable of type **unsigned short int**
+    * properly store this in a variable of type **unsigned char**
   * prompt for the ending column (0-9)
-    * properly store this in a variable of type **unsigned short int**
+    * properly store this in a variable of type **unsigned char**
-  * check to make sure starting column, row is less than or equal to ending column, row
+  * check to make sure starting column, row is less than or equal to the corresponding ending column, row
-    * if not, display an error (to STDERR) and exit with non-zero status code
+    * if not, display an error (to STDERR) and exit with non-zero status code of 2 (for row) or 3 (for column)
   * display the table, performing the indicated operation
     * display both row and column headers, in uniform fashion/formatting throughout
     * display each numerical value in organized, consistent fashion, assuming two-digit numbers
   * using a single return statement at the conclusion of the code, return a 0 indicating successful operation
+Some additional points of consideration:
+  * Note that the driving variables in your loops need to be at least of type **short int**, otherwise you may get a warning when you compile it.
+  * Some results may be negative, allow for the display of negative values in your output.
+  * with certain (not all) operations on certain values, you might end up with a mathematically impossible result. In these cases, check for and avoid performing the computation, instead displaying "NA" in its place.
+  * Only the table (headers/dividers included)should be output to STDOUT. Everything else (the input prompts) should be displayed to STDERR.
+  * For the math operations that are not associative, the row value is the one to be operated against (ie result=row-col).
+  * To display a '%' character using fprintf, repeat it: %%. That will cancel the otherwise substitutive properties of the symbol in the context of fprintf.
+=====Compiling=====
+As we have been doing all along, use the following options to gcc when compiling:
+<cli>
+lab46:~/src/c4eng/mtf1$ gcc -Wall --std=gnu99 -o mtf1 mtf1.c
+lab46:~/src/c4eng/mtf1$
+</cli>
 =====Execution=====
@@ Line 67: / Line 85: @@
 Ending Column (0-9): 7
  + |  2  3  4  5  6  7
----+------------------
+---+-------------------
 |  7  8  9 10 11 12
 |  8  9 10 11 12 13
@@ Line 74: / Line 92: @@
 </cli>
+====Sample run using subtraction====
+<cli>
+lab46:~/src/c4eng/mtf1$ ./mtf1
+Which operation: -
+Starting Row (0-9): 2
+Ending Row (0-9): 6
+Starting Column (0-9): 1
+Ending Column (0-9): 4
+ - |  1  2  3  4
+---+-------------
+|  1  0 -1 -2
+|  2  1  0 -1
+|  3  2  1  0
+|  4  3  2  1
+|  5  4  3  2
+lab46:~/src/c4eng/mtf1$
+</cli>
+====Sample run using division====
+<cli>
+lab46:~/src/c4eng/mtf1$ ./mtf1
+Which operation: /
+Starting Row (0-9): 6
+Ending Row (0-9): 9
+Starting Column (0-9): 0
+Ending Column (0-9): 4
+ / |  0  1  2  3  4
+---+----------------
+| NA  6  3  2  1
+| NA  7  3  2  1
+| NA  8  4  2  2
+| NA  9  4  3  2
+lab46:~/src/c4eng/mtf1$
+</cli>
+====Sample run using remainder====
+<cli>
+lab46:~/src/c4eng/mtf1$ ./mtf1
+Which operation: %
+Starting Row (0-9): 5
+Ending Row (0-9): 8
+Starting Column (0-9): 1
+Ending Column (0-9): 5
+ % |  1  2  3  4  5
+---+----------------
+|  0  1  2  1  0
+|  0  0  0  2  1
+|  0  1  1  3  2
+|  0  0  2  0  3
+lab46:~/src/c4eng/mtf1$
+</cli>
 ====Sample run with invalid operation given====
 <cli>
 lab46:~/src/c4eng/mtf1$ ./mtf1
-Which operation ('+' or '*'): x
+Which operation: x
-ERROR: Must specify either '+' or '*'.
+ERROR: Must specify '+', '-', '*', '/', or '%'.
 lab46:~/src/c4eng/mtf1$
 </cli>
-====Sample run with invalid column configuration====
+====Sample run with invalid row configuration====
 <cli>
 lab46:~/src/c4eng/mtf1$ ./mtf1
-Which operation ('+' or '*'): +
+Which operation: +
-Row (0-9): 5
+Starting Row (0-9): 7
-Starting Column (0-9): 7
+Ending Row (0-9): 2
-Ending Column (0-9): 2
+ERROR: Starting row is greater than ending row
-ERROR: Starting column is greater than ending column
 lab46:~/src/c4eng/mtf1$
 </cli>
+=====Reference=====
+In the C4ENG public directory, inside the **mtf1** subdirectory, will be a copy of my implementation (in executable form), which abides by the project specifications. Please compare its output against that of your implementation.
 =====Submission=====
@@ Line 125: / Line 197: @@
 *:mtf1:correct variable types and name lengths used [13/13]
 *:mtf1:proper output formatting per specifications [13/13]
-*:mtf1:submission conforms to project specifications [13/13]
 *:mtf1:runtime tests of submitted program succeed [13/13]
 *:mtf1:no negative compiler messages for program [13/13]

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