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[c]代码库

#include <math.h> 
#include <stdio.h> 

int main(void) 
{ 
   double number = 123.54; 
   double down, up; 

   down = floor(number); 
   up = ceil(number); 

   printf("original number     %5.2lf\n", number); 
   printf("number rounded down %5.2lf\n", down); 
   printf("number rounded up   %5.2lf\n", up); 

   return 0; 
}