cpp/control/nested_break Source

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Description
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shown to student

Write a program that does a <i>times table search</i>.
It takes as input an integer N.
It will print
out consecutive elements of a 9x9 times table, stopping printing
if it finds N in the table. For instance if the input is <tt>15</tt>,
it should output
<pre>
1 2 3 4 5 6 7 8 9
2 4 6 8 10 12 14 16 18
3 6 9 12 15

All done!
</pre>
If the input doesn't appear in the table, all 9x9 entries should be printed.
<br>
A solution is given, but it uses <tt>break</tt> incorrectly: it assumes
that it will stops all loops, but in reality it only stops the innermost loop.
Fix it by using a boolean control variable.

Epilogue
html markup
shown when solved

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Public permissions remove
Remarks
Comments, history, license, etc.

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Engine
Choices
json list of string, bool pairs
e.g. [["good", true], ["bad", false]]

Correct answer
Template / Reference solution

Template / Reference solution

#include <iostream>
#include <iomanip>
using namespace std;

int main() {
// declare variables
\[
int N;
bool done = false;
\show:
int N;
]\

cin >> N;

for (int i=1; \[i<10 && !done\show:i<10]\; i++) {
for (int j=1; j<10; j++) {
// print entry
cout << setw(3) << i*j;

// quit if needed
if (i*j == N) {
\[
done = true;
break;
\show:
break;
]\
}
}
cout << endl;
}

cout << endl << "All done!";
}

Java test suite
See manual

C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]
to just run once with no input use [{}]

[
{"stdin": "15"},
{"stdin": "12"},
{"stdin": "51"},
{"stdin": "49"}
]

C++ test suite
See manual

Forbidden substrings
json list of strings
e.g. ["for","while"]

["return"]
remove
Solution visibility remove
Java imports
json list of importables
e.g. ["java.util.*"]

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Override Java classname
else defaults to
websheet name
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Dependent on other websheets?
json list of websheet names in this folder
e.g. ["DataStructure"]

remove
Is example?
i.e., just a demo
remove
Add compiler flag(s)
json list of flags
e.g. ["-Wno-unused-variable"]

remove
Remove default compiler flag(s)
json list of flags
see default_cppflags
e.g. ["-Wno-write-strings"]

remove

Property	Value
Description html markup shown to student	Write a program that does a <i>times table search</i>. It takes as input an integer N. It will print out consecutive elements of a 9x9 times table, stopping printing if it finds N in the table. For instance if the input is <tt>15</tt>, it should output <pre> 1 2 3 4 5 6 7 8 9 2 4 6 8 10 12 14 16 18 3 6 9 12 15 All done! </pre> If the input doesn't appear in the table, all 9x9 entries should be printed. <br> A solution is given, but it uses <tt>break</tt> incorrectly: it assumes that it will stops all loops, but in reality it only stops the innermost loop. Fix it by using a boolean control variable.
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	remove
Engine
Choices json list of string, bool pairs e.g. `[["good", true], ["bad", false]]`
Correct answer
Template / Reference solution
Template / Reference solution	#include <iostream> #include <iomanip> using namespace std; int main() { // declare variables \[ int N; bool done = false; \show: int N; ]\ cin >> N; for (int i=1; \[i<10 && !done\show:i<10]\; i++) { for (int j=1; j<10; j++) { // print entry cout << setw(3) << ij; // quit if needed if (ij == N) { \[ done = true; break; \show: break; ]\ } } cout << endl; } cout << endl << "All done!"; }
Java test suite See manual
C++ test suite json list of stdin/args tests e.g. `[{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]` to just run once with no input use `[{}]`	[ {"stdin": "15"}, {"stdin": "12"}, {"stdin": "51"}, {"stdin": "49"} ]
C++ test suite See manual
Forbidden substrings json list of strings e.g. `["for","while"]`	["return"] remove
Solution visibility	remove
Java imports json list of importables e.g. `["java.util.*"]`	remove
Override Java classname else defaults to websheet name	remove
Dependent on other websheets? json list of websheet names in this folder e.g. `["DataStructure"]`	remove
Is example? i.e., just a demo	remove
Add compiler flag(s) json list of flags e.g. `["-Wno-unused-variable"]`	remove
Remove default compiler flag(s) json list of flags see default_cppflags e.g. `["-Wno-write-strings"]`	remove

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Note: problems are open-source by default (see 'Public permissions'). Assumed license for open problems is Creative Commons 4.0 Attribution-ShareAlike unless specified in 'Remarks'.