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    <ol> <li>In <code>void input()</code>, there should no <code>i++</code> out of <code>for</code> ?And <code>i</code> should start from 0?</li> <li>The fatal error in <code>void convert()</code> <code>for( int i = 1; i&lt;= n; i++ )</code>. since you define words as <code>string[5]</code>, it should start from <code>words[0]</code> to <code>words[4]</code>. So is <code>nums[5]</code>.</li> </ol> <p>Correction code:</p> <pre><code>#include &lt;iostream&gt; #include &lt;algorithm&gt; #include &lt;string&gt; #define n 5 using namespace std; string words[n] = {}; int nums[n]; void input(){ cout&lt;&lt;"Enter in word form, the numbers to be sorted\n"; for( int i = 0; i&lt;n ; i++){ cin &gt;&gt; words[i]; if( words[i] == "nil" ) break; //i++; } } void convert(){ cout&lt;&lt;"n = "&lt;&lt;n&lt;&lt;endl; for( int i = 0; i&lt;n; i++ ){ if ( words[i] == "one" ) nums[i] = 1; else if ( words[i] == "two") nums[i] = 2; else if ( words[i] == "three") nums[i] = 3; else if ( words[i] == "four") nums[i] = 4; else if ( words[i] == "five") nums[i] = 5; else if ( words[i] == "six") nums[i] = 6; else if ( words[i] == "seven") nums[i] = 7; else if ( words[i] == "eight") nums[i] = 8; else if ( words[i] == "nine") nums[i] = 9; else if ( words[i] == "zero") nums[i] = 0; else cout&lt;&lt;"Wrong input\n"; } } void sort(){ sort(nums, nums + n); for ( int i = 0; i &lt; n; i++ ) cout&lt;&lt; nums[i]&lt;&lt;endl; } int main(){ input(); cout &lt;&lt;"after input" &lt;&lt;endl; convert(); cout &lt;&lt;"after convert" &lt;&lt;endl; sort(); system("pause"); return 0; } </code></pre>
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