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POscanf not taking in long double
 

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  1. POscanf not taking in long double
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    <p>i have problem with scanf not reading long double in the code below:</p> <p>(please excuse my poor English)</p> <pre><code>#include &lt;iostream&gt; #include &lt;cstdlib&gt; #include &lt;math.h&gt; using namespace std; int main() { int n; scanf("%d",&amp;n); long double a,b,c,ha,hb,hc,ma,cosa,r,l,res,area; for (int i=0;i&lt;n;i++) { scanf("%Lf %Lf %Lf %Lf",&amp;a,&amp;ha,&amp;hb,&amp;hc);//this is where the problem lies, //i need to read 4 long double a,ha,hb,hc printf("%Lf %Lf %Lf %Lf\n",a,ha,hb,hc);//but it returned wrong answer so //i used printf to check, ps: the code works with float but not with double or //long double ha*=3;hb*=3;hc*=3; c=(a*ha)/hc; b=(a*ha)/hb; ma=sqrt(0.5*b*b+0.5*c*c-0.25*a*a); cosa=ha/ma; r=(2*ma)/3; l=b*(b-sqrt(a*a-hb*hb))/ha; res=sqrt(l*l+r*r-2*cosa*l*r); area=a*ha/2; printf("%.3Lf %.3Lf\n",area,res); } system("PAUSE"); return 0;} } </code></pre> <p><em><strong>here's the input:</em></strong></p> <pre><code>2 3.0 0.8660254038 0.8660254038 0.8660254038 657.8256599140 151.6154399062 213.5392629932 139.4878846649 </code></pre> <p><em><strong>and here what's show in the command line:</em></strong></p> <pre><code>2 3.0 0.8660254038 0.8660254038 0.8660254038 3.000000 -4824911833695204400000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000.000000 284622047019579100000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000000000000000000000000000000000000.0 00000 0.866025 -2.000 0.000 657.8256599140 151.6154399062 213.5392629932 139.4878846649 657.825660 -0.000000 28969688850499604000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000.000000 213.539263 -2.000 0.000 Press any key to continue . . . </code></pre> <p><em><strong>I want to know why scanf won't take in long double in the code and how to fix it.</em></strong></p> <p><em>Thanks in advance!</em></p>
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    1. USKeith Thompson
    1. USminhnhat93
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    1. COYou forgot to state your question.
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      1. USConstantinius
    2. COoh well, i think it's clear in the title, i want to know ***why scanf won't take long double in the code***
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      1. USminhnhat93
    3. COThis is not C. I suggest you keep to one language per source file: writing multi-language source files is not for the faint of heart.
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      1. USpmg
 

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