C/math.h/rint

rint: returns the value of arg rounded to the nearest integer

<source lang="cpp">

//Declaration: float rintf(float arg);

              double rint(double arg); 
              long double rintl(long double arg);  

 
 #include <math.h>
 #include <stdio.h>
 int main(void)
 {
   printf("%f\n", rint (11));
   return 0;
 }
        

/* 11.000000

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      </source>