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<title>●试题四</title>
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<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>●试题四<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>【答案】（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>1</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>tt=(STU*)malloc(sizeof(STU)*m)</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>2</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>b</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>i</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>.order>b</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>j</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>.order</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>3</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>tt<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-layout-grid-align:
none;text-autospace:none'><span style='mso-bidi-font-size:10.5pt;font-family:
宋体;mso-hansi-font-family:"Times New Roman"'>【解析】填空</span><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>1</span><span style='mso-bidi-font-size:10.5pt;
font-family:宋体;mso-hansi-font-family:"Times New Roman"'>：</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>tt</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>是结构体</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>STU</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>型指针，声明时并没有进行初始化，所以，需要使用</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>malloc()</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>函数动态申请存储空间。动态申请存储空间的大小取决于函数的形参</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>m</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>。填空</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>2</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>：按成绩高低找出前</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>m</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>名学生的方法是，先假设第一名学生成绩最高，依次与其他学生的成绩进行比较，如果出现成绩更高者，则认为这名学生成绩最高，全部比较完后找到成绩第一名的学生，存入指针</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>tt</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>所指的结构体空间中，同时将这名同学的成绩置</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>0</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，这样在其他同学中找第一名就相当于找到所有同学中的第二名，依此类推，进行</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>m</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>次循环，找到前</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>m</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>名学生。填空</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>3</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>：题目要求函数值返回动态分配的存储区的首地址，所以返回指针</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>tt</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>。</span><span
style='font-size:8.5pt;font-family:"MS Sans Serif";mso-font-kerning:0pt;
mso-ansi-language:ZH-CN'><o:p></o:p></span></p>
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