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    <p>Yo can use <code>if(cin)</code> to check the state of the input stream and since operator>> will return the input stream that was passed to it you can use <code>if(cin&gt;&gt;iUserguess)</code></p> <p>If cin is in a failed state -maybe because the user entered a non number- the expression <code>if(cin&gt;&gt;iUserguess)</code> will evaluate to false.</p> <p>If the user enters a non number you will need to call <code>cin.clear()</code> to clear the stream state and <code>cin.ignore()</code> to discard the input, before trying to read a number again.</p> <p>so using your example, it could be changed to this:</p> <pre><code>#include &lt;iostream&gt; #include &lt;ctime&gt; #include &lt;limits&gt; using namespace std; int main() { int iGumballs; int iUserguess; int iGuesses = 0; while (true) { system("CLS"); iGuesses = 0; srand(static_cast&lt;unsigned int&gt;(time(0))); iGumballs = rand()%1000+1; cout &lt;&lt; "How many gumballs are in the bumball jar? You guess! 1-1000" &lt;&lt; endl; do { cout &lt;&lt; "Enter your guess: "; if(cin &gt;&gt; iUserguess) { iGuesses ++; if(iUserguess &gt; iGumballs) { cout &lt;&lt; "Too high!" &lt;&lt; endl &lt;&lt; endl; continue; } if(iUserguess &lt; iGumballs) { cout &lt;&lt; "Too low!" &lt;&lt; endl &lt;&lt; endl; continue; } } else { cout&lt;&lt;"incorrect input - try again\n\n"; cin.clear(); cin.ignore(numeric_limits&lt;streamsize&gt;::max(),'\n'); continue; } } while(iUserguess &gt; iGumballs || iUserguess &lt; iGumballs); cout &lt;&lt; "You guessed the right amout of gumballs" &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "You took " &lt;&lt; iGuesses &lt;&lt; " guesses" &lt;&lt; endl &lt;&lt; endl; system ("pause"); } return 0; } </code></pre>
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    1. UScoelhudo
    1. USNikanos Polykarpou
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    1. COIt accepts values that begins with a digit (e.g. 0xxx, "Too low!" output).
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      1. UScoelhudo
    2. COThen it would be better to use the string solution. Read your input as string and do whatever checks you need as in @coelhudo's example
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      1. USNikanos Polykarpou
    3. COHmm ok, thanks for all the help folks.
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      1. USJohn Brown
 

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