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POC++ input operator overload ">>"
 

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  1. POC++ input operator overload ">>"
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    <p>I have a rational number class is made up of two integers: <code>num</code>, the nominator, and <code>den</code>, the denominator.</p> <p>The following operator is supposed to read the rational number from a stream.</p> <pre><code>istream&amp; operator &gt;&gt; (istream&amp; Is, rational&amp; r) { char c; //Test char. double n; //Could be either the numerator of the fraction or the antiperiod of the repeating decimal number. Is &gt;&gt; n; int i = 0; for (; n*10-pow(10, i+1) &lt; 1 &amp;&amp; int(n) != 0; i++) { n *= 10; } for (; int(n*10) % 10; i++) { n *= 10; } n /= pow(10, i); if (i == 0) { r.num = n; Is &gt;&gt; ws; c = Is.peek(); if (c == '/') { c = Is.get(); Is &gt;&gt; r.den; } else { r.den = 1; } r.normalize(); //This function normalizes the fraction. } else { Is &gt;&gt; ws; c = Is.peek(); if (c == 'p' || c == 'P') { int p; //Period of the repeating decimal number. c = Is.get(); Is &gt;&gt; p; vector&lt;int&gt; a = genFrac(n, p); //This function returns the fraction which express the decimal repeating number. It returns a "vector&lt;int&gt;" with the nominator at index 1 e denominator at index 0. r.num = a[1]; r.den = a[0]; } else { i = 0; for (; n*10-pow(10, i+1) &lt; 1 &amp;&amp; int(n) != 0; i++) { n *= 10; } for (; int(n*10) % 10 != 0; i++) { n *= 10; } int pot10 = pow(10, i); r.num = n; r.den = pot10; } r.normalize(); } return Is; } </code></pre> <p>I wrote this code to implement the input of my "rational" class. I modified it from the one written in my C++ book in order to make possible the input of decimal numbers, including repeating ones.</p> <p>It should be able to handle these types of input:</p> <ul> <li>9/8</li> <li>9</li> <li>9.87</li> <li>1.p3 (= 1.3333333333)</li> </ul> <p>But it doesn't work, not even the part I copied from the book.</p> <p>Can anyone help me?</p>
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    1. USfpiro07
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    1. COAre you getting compilation errors, runtime errors, unexpected output? Details on how it's failing will be helpful.
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    2. COI don't get errors, it's just that if I for example try the d) type of input it stops at the "c = is.peek()" because it waits for another character but I want the "p" to be that character... I don't know if you understood it's quite complicated to explain. It definitely is a bug in the algorithm but I can't find it.
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    3. COWhy don't you read the whole stream first and then analyze it?
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