C语言库floor()函数

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

int main () {
   float val1, val2, val3, val4;

   val1 = 1.6;
   val2 = 1.2;
   val3 = 2.8;
   val4 = 2.3;

   printf("Value1 = %.1lf/n", floor(val1));
   printf("Value2 = %.1lf/n", floor(val2));
   printf("Value3 = %.1lf/n", floor(val3));
   printf("Value4 = %.1lf/n", floor(val4));

   return(0);
}