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#include 
   
    union FLOATUN{   	unsigned int a;	float b;};int main(){   	FLOATUN fun;	fun.b = 12.34;	printf("c:%x\n",fun.a);	double a = 12.34;	fun.b = (float) a;	printf("c:%x\n",fun.a);		double c = 12.34;	float *p;	p = (float *) &c;	printf("float c:%f\n",*p);}
   

输出结果

c:414570a4c:414570a4float c:584860314976236483507101602781593600.000000

只要不超出范围，double可以强转float