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Given a positive integer from the user, <tt>n</tt>, output <tt>prime</tt> or <tt>not prime</tt> based on whether the number is actually prime.
<p>
A number is prime if it has no divisors other than itself and one.
The first few primes are 2, 3, 5, 7, 11, …

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Copied from problem cpp/control/isprime2 (author: redekopp@usc.edu)

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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 <cmath>
using namespace std;

int main() {
int n;
cin >> n;

\[
bool isPrime = true;

for(int i=2; i < sqrt(n); i++) {
if (n%i == 0) { // does i divide n?
isPrime = false;
break;
}
}

if( isPrime ){
cout << "prime" << endl;
}
else {
cout << "not prime" << endl;
}
]\
return 0;
}

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": "100"},
{"stdin": "17"},
{"stdin": "3"},
{"stdin": "4"},
{"stdin": "37"},
{"stdin": "39"}
]

C++ test suite
See manual

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e.g. ["DataStructure"]

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i.e., just a demo
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Property	Value
Description html markup shown to student	Given a positive integer from the user, <tt>n</tt>, output <tt>prime</tt> or <tt>not prime</tt> based on whether the number is actually prime. <p> A number is prime if it has no divisors other than itself and one. The first few primes are 2, 3, 5, 7, 11, …
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	Copied from problem cpp/control/isprime2 (author: redekopp@usc.edu) 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 <cmath> using namespace std; int main() { int n; cin >> n; \[ bool isPrime = true; for(int i=2; i < sqrt(n); i++) { if (n%i == 0) { // does i divide n? isPrime = false; break; } } if( isPrime ){ cout << "prime" << endl; } else { cout << "not prime" << endl; } ]\ return 0; }
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": "100"}, {"stdin": "17"}, {"stdin": "3"}, {"stdin": "4"}, {"stdin": "37"}, {"stdin": "39"} ]
C++ test suite See manual
Forbidden substrings json list of strings e.g. `["for","while"]`	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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