程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 100

int main()
{

    float  ten_hex = 0;
    int     inum = 0;
    float  fnum = 0;

    scanf ("%f", &ten_hex);

    inum = (int)ten_hex;
    fnum = ten_hex - inum;

    printf ("inum is %d\nfnum = %f\n", inum, fnum);    //输入123.456          结果   inum = 123, fnum = 0.456001        后面的1哪来的。。。

    return 0;
}