#define ?GET(p)?(*(p)?|?(*(p+1)?<<?8)?|?(*(p+2)?<<?16)?|?(*(p+3)?<<?24))

void ?printb(unsigned? int ?n)
... {
????unsigned?char?B[32]?=?...{0,};
????bool?flag?=?false;
????
????int?j?=?0;
????for?(int?i=31;i>=0;i--)
????...{
????????unsigned?int?p;
????????p?=?n?<<?31?-?i?>>?31;

????????if?(!flag)
????????...{
????????????if?(p?==?1)
????????????...{
????????????????flag?=?true;
????????????}
????????}?
????????
????????if?(flag)
????????...{
????????????B[j]?=?(p?==?1)?'1':'0';
????????????j?++;
????????}
????}
????printf("%s",B);
}

int ?main( int ?argc,? char * ?argv[])
... {
????float?f?=?-289.95;

????//单精度浮点
????unsigned?int?sign;//符号
????unsigned?int?significand;//有效位
????unsigned?int?exponent;//指数
????unsigned?int?floatbyte;
????unsigned?char?*?pfloat?=?(unsigned?char*)&f;
????
????floatbyte?=?GET(pfloat);
????
????sign?=?floatbyte?>>?31;
????exponent?=?floatbyte?<<?1?>>?24;
????significand?=?floatbyte?<<?9?>>?9;
????
????printf("符号位:");
????printb(sign);
????printf(" 指数位:");
????printb(exponent);
????printf(" 有效位:");
????printb(significand);
????
????//输出结果
????printf(" 单进度浮点数为:");
????if?(sign?==?1)
????...{
????????printf("-");
????}?else...{
????????printf("+");
????}
????
????printf("1.");
????printb(significand);
????
????//这里只讨论指数为规范化值的情况，对于零和无穷大不讨论
????if?(int(exponent?-?127)?>?0)
????...{
????????printf("?>>?%d ",exponent?-?127);
????}?else?...{
????????printf("?<<?%d ",127?-?exponent);
????}

????return?0;
}
cs