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ÕâÊǶ¨ÒåµÄÄǶλ° bitset<30> bitset_quiz1; // bitset solution unsigned long int_quiz1 = 0; // simulated collection of bits In the bitset case we can define bitset_quiz1 to be exactly the size we need. By default each of the bits is set to zero. In the case where we use a built-in type to hold our quiz results, we define int_quiz1 as an unsigned long, meaning that it will have at least 32 bits on any machine. Finally, we explicitly initialize int_quiz1 to ensure that the bits start out with well-defined values. ÕâÀïÊÇΪÁË˵Ã÷2¸ö½â¾ö·½°¸,ҪôÓÃbitset,ҪôÓÃunsigned long,¶¼¿ÉÒÔ. ÏÂÃæÊÇÉèÖõÚ27¸öѧÉúµÄ³É¼¨(¶¼ÊÇ´ÓÓÒÍù×óÊýµÄ) bitset_quiz1.set(27); // indicate student number 27 passed int_quiz1 |= 1UL<<27; // indicate student number 27 passed µÚÒ»¸öbitsetÖ±½Ó.set¾Í¿ÉÒÔ,×¢ÒâµÚ¶þ¸öÊǸö¼òдµÄλ»ò²Ù×÷(|=),1UL<<27Ö®ºó,´ÓÓÒÍù×óµÚ27λÖÃ1,È»ºóÓëint_quiz1°´Î»Óë,¿ÉÒÔ½«int_quiz1µÄµÚ27λÖÃ1,¶ø²»Ó°ÏìÆäËûѧÉúµÄ³É¼¨. |

2Â¥2013-06-04 17:20:44
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3Â¥2013-06-05 08:45:08
zhanglinfeng
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4Â¥2013-06-05 10:44:24













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