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#include
   
    void printBinaryDigit(float *pf){	int n = *(int *)pf;	int sizeOfBits = sizeof(int) * 8;	int i = sizeOfBits - 1;	for(i = sizeOfBits - 1; i >= 0; i--)	{		if(n & (1 << i))		{			printf("1");		}		else		{			printf("0");		}	}	printf("\n");}int main(){	float f = -1.0;	for(f = -1.0; f < 1.0; f += (float)0.1)	{		printf("%f--->", f);		printBinaryDigit(&f);	}	return 0;}
   

       结果：

-1.000000--->10111111100000000000000000000000

-0.900000--->10111111011001100110011001100110 -0.800000--->10111111010011001100110011001100 -0.700000--->10111111001100110011001100110010 -0.600000--->10111111000110011001100110011000 -0.500000--->10111110111111111111111111111101 -0.400000--->10111110110011001100110011001010 -0.300000--->10111110100110011001100110010111 -0.200000--->10111110010011001100110011001000 -0.100000--->10111101110011001100110011000011 0.000000--->00110011101000000000000000000000 0.100000--->00111101110011001100110011010111 0.200000--->00111110010011001100110011010010 0.300000--->00111110100110011001100110011100 0.400000--->00111110110011001100110011001111 0.500000--->00111111000000000000000000000001 0.600000--->00111111000110011001100110011011 0.700000--->00111111001100110011001100110101 0.800000--->00111111010011001100110011001111 0.900000--->00111111011001100110011001101001

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