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<p>Write a program that generates 2 random flips of a fair coins (0 = heads, 1 = tails).</p>

<p>Use the <code>rand()</code> function to generate a random integer between 0 and about 2 billion. Then convert that to a 0 or 1 with equal probability.</p>

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Copied from problem cpp/var-expr/change (author: redekopp@usc.edu)
Copied from problem cpp/cin/deg2rad (author: redekopp@usc.edu)
Copied from problem cpp/var-expr/in_n_days (author: redekopp@usc.edu)
Copied from problem cpp/var-expr/char_arith (author: redekopp@usc.edu)
Copied from problem cpp/var-expr/hello (author: daveagp@gmail.com)

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Template / Reference solution

#include <iostream> // contains cin/cout
#include <cstdlib> // contains rand()
using namespace std;

int main() {

int flip1, flip2;
\hide[
// This "seeds" the random number generator to allow
// different random values to be produced on each program run
srand(time(0));
]\

\[
flip1 = rand() % 2;
flip2 = rand() % 2;

]\

cout << "Flips are " << flip1 << " and " << flip2 << endl;

return 0;
}

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to just run once with no input use [{}]

[
{"stdin":"", "args":[]}

]

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Property	Value
Description html markup shown to student	<p>Write a program that generates 2 random flips of a fair coins (0 = heads, 1 = tails).</p> <p>Use the <code>rand()</code> function to generate a random integer between 0 and about 2 billion. Then convert that to a 0 or 1 with equal probability.</p>
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	Copied from problem cpp/var-expr/change (author: redekopp@usc.edu) Copied from problem cpp/cin/deg2rad (author: redekopp@usc.edu) Copied from problem cpp/var-expr/in_n_days (author: redekopp@usc.edu) Copied from problem cpp/var-expr/char_arith (author: redekopp@usc.edu) Copied from problem cpp/var-expr/hello (author: daveagp@gmail.com) 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> // contains cin/cout #include <cstdlib> // contains rand() using namespace std; int main() { int flip1, flip2; \hide[ // This "seeds" the random number generator to allow // different random values to be produced on each program run srand(time(0)); ]\ \[ flip1 = rand() % 2; flip2 = rand() % 2; ]\ cout << "Flips are " << flip1 << " and " << flip2 << 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":"", "args":[]} ]
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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