double 转 float 精度的丢失

double_to_float.c

/*
 * (gdb) print d
 * $1 = 10.1
 * (gdb) print f
 * $2 = 10.1000004
 */

#include <stdlib.h>

int main() {
  double d = atof("10.1");
  float f = (float)d;
  return 0;
}