C库函数 floor()

#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);

}