程序代码：

struct book
{
    int n;
    int m;
}ibook;

int main(int argc, char *argv[])
{
    float f = 0.123;
    (float)ibook.n = f;
    printf("f = %f\n", *(float*)(&ibook.n));
    return 0;
}

程序代码：

struct book
{
    int n;
    int m;
}ibook;

int main(int argc, char *argv[])
{
    float f = 0.123;
    ibook.n = (int)&f;
    printf("f = %f\n", *(float*)(ibook.n));
    return 0;
}