c++常见问题答案.htm

面试题 希望对大家有所帮助 成功走向程序员之路

            style="FONT-FAMILY: 宋体">程序员的基本编程技能。内容限于</SPAN><SPAN 
            lang=EN-US>C++/C</SPAN><SPAN 
            style="FONT-FAMILY: 宋体">常用语法，不涉及数据结构、算法以及深奥的语法。考试成绩能反映出考生的编程质量以及对</SPAN><SPAN 
            lang=EN-US>C++/C</SPAN><SPAN 
            style="FONT-FAMILY: 宋体">的理解程度，但不能反映考生的智力和软件开发能力。</SPAN></P>
            <P class=MsoNormal><SPAN 
            lang=EN-US><SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体">笔试时间</SPAN><SPAN 
            lang=EN-US>90</SPAN><SPAN 
            style="FONT-FAMILY: 宋体">分钟。请考生认真答题，切勿轻视。</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><O:P>&nbsp;</O:P></SPAN></P>
            <P class=MsoNormal><STRONG><SPAN 
            style="FONT-FAMILY: 宋体">一、请填写</SPAN><SPAN lang=EN-US>BOOL , float, 
            </SPAN></STRONG><STRONG><SPAN style="FONT-FAMILY: 宋体">指针变量</SPAN> 
            </STRONG><STRONG><SPAN style="FONT-FAMILY: 宋体">与“零值”比较的</SPAN><SPAN 
            lang=EN-US> if </SPAN></STRONG><STRONG><SPAN 
            style="FONT-FAMILY: 宋体">语句。（</SPAN><SPAN 
            lang=EN-US>10</SPAN></STRONG><STRONG><SPAN 
            style="FONT-FAMILY: 宋体">分）</SPAN><SPAN 
            lang=EN-US><O:P></O:P></SPAN></STRONG></P>
            <P class=MsoNormal><SPAN 
            style="FONT-FAMILY: 宋体">提示：这里“零值”可以是</SPAN><SPAN lang=EN-US>0, 0.0 , 
            FALSE</SPAN><SPAN style="FONT-FAMILY: 宋体">或者“空指针”。例如</SPAN> <SPAN 
            lang=EN-US>int </SPAN><SPAN style="FONT-FAMILY: 宋体">变量</SPAN><SPAN 
            lang=EN-US> n </SPAN><SPAN 
            style="FONT-FAMILY: 宋体">与“零值”比较的</SPAN><SPAN lang=EN-US> if 
            </SPAN><SPAN style="FONT-FAMILY: 宋体">语句为：</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN>&nbsp;&nbsp;&nbsp; 
            </SPAN>if ( n == 0 )</SPAN></P>
            <P class=MsoNormal><SPAN 
            lang=EN-US><SPAN>&nbsp;</SPAN><SPAN>&nbsp;&nbsp; </SPAN>if ( n != 0 
            )</SPAN></P>
            <P class=MsoNormal><SPAN style="FONT-FAMILY: 宋体">以此类推。</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><O:P>&nbsp;</O:P></SPAN></P>
            <TABLE class=MsoNormalTable 
            style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse" 
            cellSpacing=0 cellPadding=0 border=1>
              <TBODY>
              <TR>
                <TD 
                style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 1pt solid; WIDTH: 426.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" 
                vAlign=top width=568>
                  <P class=MsoNormal><SPAN style="FONT-FAMILY: 宋体">请写出</SPAN> 
                  <SPAN lang=EN-US>BOOL<SPAN>&nbsp; </SPAN>flag </SPAN><SPAN 
                  style="FONT-FAMILY: 宋体">与“零值”比较的</SPAN><SPAN lang=EN-US> if 
                  </SPAN><SPAN style="FONT-FAMILY: 宋体">语句：</SPAN></P>
                  <P class=MsoNormal><SPAN 
                  lang=EN-US><O:P>&nbsp;</O:P></SPAN></P>
                  <P class=MsoNormal><SPAN 
                  lang=EN-US><O:P>&nbsp;</O:P></SPAN></P></TD></TR>
              <TR>
                <TD 
                style="BORDER-RIGHT: 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: 1pt solid; WIDTH: 426.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: 1pt solid" 
                vAlign=top width=568>
                  <P class=MsoNormal><SPAN style="FONT-FAMILY: 宋体">请写出</SPAN> 
                  <SPAN lang=EN-US>float<SPAN>&nbsp; </SPAN>x </SPAN><SPAN 
                  style="FONT-FAMILY: 宋体">与“零值”比较的</SPAN><SPAN lang=EN-US> if 
                  </SPAN><SPAN style="FONT-FAMILY: 宋体">语句：</SPAN></P>
                  <P class=MsoNormal><SPAN 
                  lang=EN-US><O:P>&nbsp;</O:P></SPAN></P>
                  <P class=MsoNormal><SPAN 
                  lang=EN-US><O:P>&nbsp;</O:P></SPAN></P>
                  <P class=MsoNormal><SPAN 
                  lang=EN-US><O:P>&nbsp;</O:P></SPAN></P></TD></TR>
              <TR>
                <TD 
                style="BORDER-RIGHT: 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: 1pt solid; WIDTH: 426.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: 1pt solid" 
                vAlign=top width=568>
                  <P class=MsoNormal><SPAN style="FONT-FAMILY: 宋体">请写出</SPAN> 
                  <SPAN lang=EN-US>char <SPAN>&nbsp;</SPAN>*p </SPAN><SPAN 
                  style="FONT-FAMILY: 宋体">与“零值”比较的</SPAN><SPAN lang=EN-US> if 
                  </SPAN><SPAN style="FONT-FAMILY: 宋体">语句：</SPAN></P>
                  <P class=MsoNormal><SPAN 
                  lang=EN-US><O:P>&nbsp;</O:P></SPAN></P>
                  <P class=MsoNormal><SPAN 
                  lang=EN-US><O:P>&nbsp;</O:P></SPAN></P></TD></TR></TBODY></TABLE>
            <P class=MsoNormal><SPAN lang=EN-US><O:P>&nbsp;</O:P></SPAN></P>
            <P class=MsoNormal><SPAN 
            style="COLOR: blue; FONT-FAMILY: 宋体">一、请填写</SPAN><SPAN lang=EN-US 
            style="COLOR: blue">BOOL , float, </SPAN><SPAN 
            style="COLOR: blue; FONT-FAMILY: 宋体">指针变量</SPAN><SPAN 
            style="COLOR: blue"> </SPAN><SPAN 
            style="COLOR: blue; FONT-FAMILY: 宋体">与“零值”比较的</SPAN><SPAN lang=EN-US 
            style="COLOR: blue"> if </SPAN><SPAN 
            style="COLOR: blue; FONT-FAMILY: 宋体">语句。（</SPAN><SPAN lang=EN-US 
            style="COLOR: blue">10</SPAN><SPAN 
            style="COLOR: blue; FONT-FAMILY: 宋体">分）</SPAN><SPAN lang=EN-US 
            style="COLOR: blue"><O:P></O:P></SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US 
            style="COLOR: blue"><O:P>&nbsp;</O:P></SPAN></P>
            <TABLE class=MsoNormalTable 
            style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse" 
            cellSpacing=0 cellPadding=0 border=1>
              <TBODY>
              <TR>
                <TD 
                style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; BACKGROUND: rgb(217,217,217) 0% 50%; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 1pt solid; WIDTH: 436pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; moz-background-clip: -moz-initial; moz-background-origin: -moz-initial; moz-background-inline-policy: -moz-initial" 
                vAlign=top width=581 colSpan=2>
                  <P class=MsoNormal><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">请写出</SPAN><SPAN 
                  style="COLOR: blue"> <SPAN lang=EN-US>BOOL<SPAN>&nbsp; 
                  </SPAN>flag </SPAN></SPAN><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">与“零值”比较的</SPAN><SPAN 
                  lang=EN-US style="COLOR: blue"> if </SPAN><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">语句。（</SPAN><SPAN 
                  lang=EN-US style="COLOR: blue">3</SPAN><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">分）</SPAN><SPAN lang=EN-US 
                  style="COLOR: blue"><O:P></O:P></SPAN></P></TD></TR>
              <TR>
                <TD 
                style="BORDER-RIGHT: 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: 1pt solid; WIDTH: 218pt; PADDING-TOP: 0cm; BORDER-BOTTOM: 1pt solid" 
                vAlign=top width=291>
                  <P class=MsoNormal><STRONG><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">标准答案：</SPAN><SPAN 
                  lang=EN-US style="COLOR: blue"><O:P></O:P></SPAN></STRONG></P>
                  <P class=MsoNormal><STRONG><SPAN lang=EN-US 
                  style="COLOR: blue"><SPAN>&nbsp;&nbsp;&nbsp; </SPAN>if ( flag 
                  )<O:P></O:P></SPAN></STRONG></P>
                  <P class=MsoNormal><STRONG><SPAN lang=EN-US 
                  style="COLOR: blue"><SPAN>&nbsp;&nbsp;&nbsp; </SPAN>if ( !flag 
                  )</SPAN></STRONG><SPAN lang=EN-US 
                  style="COLOR: blue"><O:P></O:P></SPAN></P></TD>
                <TD 
                style="BORDER-RIGHT: 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 218pt; PADDING-TOP: 0cm; BORDER-BOTTOM: 1pt solid" 
                vAlign=top width=291>
                  <P class=MsoNormal><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">如下写法均属不良风格，不得分。</SPAN><SPAN 
                  lang=EN-US style="COLOR: blue"><O:P></O:P></SPAN></P>
                  <P class=MsoNormal style="MARGIN-LEFT: 21pt"><SPAN lang=EN-US 
                  style="COLOR: blue; FONT-FAMILY: 宋体"><SPAN>&nbsp;&nbsp;&nbsp; 
                  </SPAN>if (flag == TRUE)<SPAN>&nbsp;&nbsp; 
                  </SPAN><O:P></O:P></SPAN></P>
                  <P class=MsoNormal style="MARGIN-LEFT: 21pt"><SPAN lang=EN-US 
                  style="COLOR: blue; FONT-FAMILY: 宋体"><SPAN>&nbsp;&nbsp;&nbsp; 
                  </SPAN>if (flag == 1 )<SPAN> </SPAN><SPAN>&nbsp;&nbsp;&nbsp; 
                  </SPAN><O:P></O:P></SPAN></P>
                  <P class=MsoNormal style="MARGIN-LEFT: 21pt"><SPAN lang=EN-US 
                  style="COLOR: blue; FONT-FAMILY: 宋体"><SPAN>&nbsp;&nbsp;&nbsp; 
                  </SPAN>if (flag == FALSE) 
                  <SPAN>&nbsp;</SPAN><O:P></O:P></SPAN></P>
                  <P class=MsoNormal><SPAN lang=EN-US 
                  style="COLOR: blue; FONT-FAMILY: 宋体"><SPAN>&nbsp;&nbsp;&nbsp; 
                  </SPAN><SPAN>&nbsp;&nbsp;&nbsp; </SPAN>if (flag == 
                  0)<SPAN>&nbsp; </SPAN><SPAN>&nbsp;&nbsp;&nbsp; 
                  </SPAN></SPAN><SPAN lang=EN-US 
                  style="COLOR: blue"><O:P></O:P></SPAN></P></TD></TR>
              <TR>
                <TD 
                style="BORDER-RIGHT: 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; BACKGROUND: rgb(217,217,217) 0% 50%; PADDING-BOTTOM: 0cm; BORDER-LEFT: 1pt solid; WIDTH: 436pt; PADDING-TOP: 0cm; BORDER-BOTTOM: 1pt solid; moz-background-clip: -moz-initial; moz-background-origin: -moz-initial; moz-background-inline-policy: -moz-initial" 
                vAlign=top width=581 colSpan=2>
                  <P class=MsoNormal><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">请写出</SPAN><SPAN 
                  style="COLOR: blue"> <SPAN lang=EN-US>float<SPAN>&nbsp; 
                  </SPAN>x </SPAN></SPAN><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">与“零值”比较的</SPAN><SPAN 
                  lang=EN-US style="COLOR: blue"> if </SPAN><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">语句。（</SPAN><SPAN 
                  lang=EN-US style="COLOR: blue">4</SPAN><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">分）</SPAN><SPAN lang=EN-US 
                  style="COLOR: blue"><O:P></O:P></SPAN></P></TD></TR>
              <TR>
                <TD 
                style="BORDER-RIGHT: 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: 1pt solid; WIDTH: 218pt; PADDING-TOP: 0cm; BORDER-BOTTOM: 1pt solid" 
                vAlign=top width=291>
                  <P class=MsoNormal><STRONG><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">标准答案示例：</SPAN><SPAN 
                  lang=EN-US style="COLOR: blue"><O:P></O:P></SPAN></STRONG></P>
                  <P class=MsoNormal><STRONG><SPAN lang=EN-US 
                  style="COLOR: blue">const float EPSINON = 
                  0.00001;<O:P></O:P></SPAN></STRONG></P>
                  <P class=MsoNormal><STRONG><SPAN lang=EN-US 
                  style="COLOR: blue">if ((x &gt;= - EPSINON) &amp;&amp; (x 
                  &lt;= EPSINON)<O:P></O:P></SPAN></STRONG></P>
                  <P class=MsoNormal><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">不可将浮点变量用“<SPAN 
                  lang=EN-US>==</SPAN>”或“！<SPAN 
                  lang=EN-US>=</SPAN>”与数字比较，应该设法转化成“<SPAN 
                  lang=EN-US>&gt;=</SPAN>”或“<SPAN 
                  lang=EN-US>&lt;=</SPAN>”此类形式。</SPAN><SPAN lang=EN-US 
                  style="COLOR: blue"><O:P></O:P></SPAN></P>
                  <P class=MsoNormal><SPAN lang=EN-US 
                  style="COLOR: blue"><SPAN>&nbsp;&nbsp; 
                  </SPAN><O:P></O:P></SPAN></P></TD>
                <TD 
                style="BORDER-RIGHT: 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 218pt; PADDING-TOP: 0cm; BORDER-BOTTOM: 1pt solid" 
                vAlign=top width=291>
                  <P class=MsoNormal><SPAN lang=EN-US 
                  style="COLOR: blue; FONT-FAMILY: 宋体"><O:P>&nbsp;</O:P></SPAN></P>
                  <P class=MsoNormal><SPAN 
                  style="COLOR: blue; FONT-FAMILY: 宋体">如下是错误的写法，不得分。</SPAN><SPAN 
                  lang=EN-US style="COLOR: blue"><O:P></O:P></SPAN></P>
                  <P class=MsoNormal style="MARGIN-LEFT: 21pt"><SPAN lang=EN-US