main.cpp

$//$ CS $141$ Lab $4$: Multiplication Table starter code.

$//$ Complete the code to display all or part of a multiplication table.

$//$

#include

#include $//$ for setw$()$

using namespace std;

$/*------------------------------------------------------------$

Use a loop to display the numbers $1.\mathrm{.}10$

Sample output:

Lab $4$: Using loops

$1.$ Show single row

$2.$ Show multiplication table

$3.$ Show a subset of a multiplication table

$4.$ Exit the program.

Your choice $(1-4)-->1$

Enter the limit for the line of numbers: $8$

Single line:

$12345678$

Done.

$*/$

void singleLine$($ int limit$)$

$\{$

cout $<<$ "Single line:" $<<$ endl;

$//$ Your code goes here

$//...$

$\}//$end singleLine$()$

$/*------------------------------------------------------------$

Use a loop within a loop to display a multiplication table

Sample output:

Lab $4$: Using loops

$1.$ Show single row

$2.$ Show multiplication table

$3.$ Show a subset of a multiplication table

$4.$ Exit the program.

Your choice $(1-4)-->2$

Multiplication Table:

$12345678910$

$2468101214161820$

$36912151821242730$

$481216202428323640$

$5101520253035404550$

$6121824303642485460$

$7142128354249566370$

$8162432404856647280$

$9182736455463728190$

$102030405060708090100$

Done.

$*/$

void allRowsAndColumns$($int size$)$

$\{$

cout $<<$ "Multiplication Table:" $<<$ endl;

$//$ Your code goes here, with a loop for the rows, and inside of that

$//$ a loop for the columns within that row.

$//...$

$\}//$end allRowsAndColumns$()$

$/*------------------------------------------------------------$

Use a loop within a loop to display a subset from a

multiplication table, showing only some rows and columns.

Sample output:

Lab $4$: Using loops

$1.$ Show single row

$2.$ Show multiplication table

$3.$ Show a subset of a multiplication table

$4.$ Exit the program.

Your choice $(1-4)-->3$

Enter the row start and limit$,$ and the col start and limit: $2458$

Multiplication Table for rows $2$ to $4$ and columns $5$ to $8$

$10121416$

$15182124$

$20242832$

Done.

$*/$

void selectRowsAndColumns$($int rowStart, int rowLimit, int colStart, int colLimit$)$

$\{$

cout $<<$ "Multiplication Table for $"$

$<<$ "rows $"<<$ rowStart $<<"$ to $"<<$ rowLimit $<<"$ and $"$

$<<$ "columns $"<<$ colStart $<<"$ to $"<<$ colLimit

$<<$ endl;

$//$ Your code goes here

$//...$

$\}//$end selectRowsAndColumns$()$

$/*------------------------------------------------------------$

Display menu options and jump to the corresponding code.

$*/$

int main$()$

$\{$

$//$ Declare variables to use in displaying all or part of a table.

$//$ These variables don't all get used in all the cases below.

int rowStart, rowLimit, colStart, colLimit, size;

$//$ Initialize them all to $0$

rowStart$=$rowLimit$=$colStart$=$colLimit$=$size$=0$;

$//$ Used to handle the menu option

char menuChoice $=\text{'}\text{'}$;

while$($menuChoice $!=\text{'}4\text{'})\{$

cout $<<"$

$"$

$<<$ "Lab $4$: Using loops

$"$

$<<"1.$ Show single row

$"$

$<<"2.$ Show multiplication table

$"$

$<<"3.$ Show a subset of a multiplication table

$"$

$<<"4.$ Exit the program.

$"$

$<<$ "Your choice $(1-4)-->"$;

cin $>>$ menuChoice;

cout $<<$ endl;

$//$ Handle menu choice to exit the program

if$($ menuChoice $==\text{'}4\text{'})\{$

cout $<<$ "Exiting"

$<<$ endl;

$\}$

else if$($ menuChoice $==\text{'}1\text{'})\{$

$//$ Show a single line up to some limit

cout $<<$ "Enter the limit for the line of numbers: $"$;

cin $>>$ colLimit;

singleLine$($ colLimit$)$;

$\}$

else if$($ menuChoice $==\text{'}2\text{'})\{$

cout $<<$ "Enter the size for the multiplication table: $"$;

cin $>>$ size;

$//$ Show all rows and columns in the multiplication table

allRowsAndColumns$($size$)$;

$\}$

else if$($ menuChoice $==\text{'}3\text{'})\{$

$//$ Show just the selected subset of the multiplication table

cout $<<$ "Enter the row start and limit$,$ and the col start and limit: $"$;

cin $>>$ rowStart $>>$ rowLimit $>>$ colStart $>>$ colLimit;

selectRowsAndColumns$($ rowStart, rowLimit, colStart, colLimit$)$;

$\}$

$\}$

cout $<<$ "Done." $<<$ endl;

return $0$;

$\}//$end main$()$