c++ - wrong ans when using long double and correct when using double -


when declared ans long double , used "%lf" in printf, i'm getting -0.000 output. when declared ans double , used "%lf" in printf, i'm getting correct ans

#include <iostream> #include <stdio.h> #include <algorithm> using namespace std; #define ll long long int int main() {     ll i,j,k,n,l,a[100000],ma;     cin>>n>>l;     for(i=0;i<n;i++)     {         cin>>a[i];     }     sort(a,a+n);     ma=0;     for(i=1;i<n;i++)     {         if(a[i]-a[i-1]>ma)ma=a[i]-a[i-1];     }     ll ans1,ans2;     ans1=a[0];     ans2=l-a[n-1];     long double ans=max(ans1,ans2);     long double rap=ma/2.000;     if(rap>ans)ans=rap;     printf("%lf",ans);     return 0; }

thanks in advance

the issue in last prinft("%lf", ans); function. specify format lf, when you're trying pass double fails. using cout instead solves issue, or using f printf format. btw, code "fails" double, , "works" long double, not other way around.


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