四川大学C语言2001q真题_跨考网
一、单w择?span lang="EN-US">(在每题的四个备选答案中Q选出一个正的{案Qƈ其L(fng)写在{题U怸。请注意注明题号。每题1分,p6?span lang="EN-US">)
1?span lang="EN-US">‘\t?/span>表示什?span lang="EN-US">?
?/span>字符串常?span lang="EN-US"> ?/span>标识W?span lang="EN-US"> ?/span>变量 ?/span>字符帔R
{案Q?span lang="EN-US">?p>
2、对宏定义不正确的描q是哪一?span lang="EN-US">?
?/span>在进行宏定义Ӟ可以引用已经定义的宏名,可以层层|换
//可以引用已经定义?jin)的宏?span lang="EN-US">,可以层层|换
?/span>宏名的有效范围包括本文g的Q何位|?span lang="EN-US">
//宏名的有效范围定义命令之后到本源文gl束Q可以用#definel止宏定义的作用?span lang="EN-US">
?/span>宠定义不是语句,不必在行末加分号
//是预处理定义语句
?/span>对程序中双引hh的字W串Q即使与宏名相同Q也不进行置?span lang="EN-US">
3、若定义static char s[20]=”computer?则执行语?span lang="EN-US">x = strlen(s);之后Q?span lang="EN-US">x的gؓ(f)多少?
?0 ? ? ?9
//strlen函数计算char*型字W串的长度的时候,q不包含末尾?span lang="EN-US">\0;
4、以下哪一个表辑ּ取值是正确?span lang="EN-US">?
?>5l果?span lang="EN-US">6 ?&&5l果?span lang="EN-US">7
?||5l果?span lang="EN-US">7 ?<5l果?span lang="EN-US">0
5、如定义
enum weekday {one, two, thr, fou, fiv?span lang="EN-US">;
enum weekday working;
以下哪个是不正确的枚丑֏量的使用?
①working = thr; ②working =2;
③working = (enum weekday)2;
④working = (enum weekday) (5-3);
//不能对其赋?span lang="EN-US">
6、下列说法中正确的是哪一?span lang="EN-US">?
①sizeof (char) 是结果ؓ(f)整型的表辑ּ
②sizeof (char) 是一个不合法的表CŞ?span lang="EN-US">
③sizeof (char) 是一U函数调?span lang="EN-US">
④sizeof (char) 是结果ؓ(f)实型的表辑ּ
二、阅ȝ序,q回{问?span lang="EN-US">(?span lang="EN-US">12?span lang="EN-US">)
1、下列程序的输出是什?span lang="EN-US">?(3?span lang="EN-US">)
# include
void main ()
H?span lang="EN-US">
char * aplha [6] = H?span lang="EN-US">“ABC?/span>Q?span lang="EN-US">“DEF?/span>Q?span lang="EN-US">“GHI?/span>Q?span lang="EN-US">“JKL?/span>Q?span lang="EN-US">“MNO?/span>Q?span lang="EN-US">“PQR?/span>H?span lang="EN-US">;
char **p;
int i;
p = aplha;
for (i = 0; i<4; i++)
printf (?s? p[i]);
printf (“\n?;
H?span lang="EN-US">
//输出l果
ABCDEFGHIJKL
刚好是字W串数组里面的前四个元素的内容连接v?span lang="EN-US">
2、下列程序ؓ(f)什么无法将用户输入的三个整数按从小到大排序输出?应该如何修改?(6?span lang="EN-US">)
# include
void swap (int x, int y)
H?span lang="EN-US">
int t = x;
x = y;
y = t;
H?span lang="EN-US">
void main ()
H?span lang="EN-US">
int a, b, c;
scanf (?d, %d, %d? &a, &b, &c);
if (a>b) swap (a, b);
if (a>c) swap (a, c);
if (b>c) swap (b, c);
printf (?d, %d, %d? a, b, c);
H?span lang="EN-US">
//函数swap采用g递,虽然Ş?span lang="EN-US">x?span lang="EN-US">y交换?jin),但是q不影响到实参。将g递改成指针传递就可以?jin)?span lang="EN-US">
C函数参数采用g递方式,虽然swap函数Ş式参?span lang="EN-US">x?span lang="EN-US">y的D行了(jin)调换Q但是媄(jing)响不到相应的实在参数。所以在dCQ通过调用sawp函数调换a?span lang="EN-US">b(?span lang="EN-US">a?span lang="EN-US">cQ或b?span lang="EN-US">c)的值是Ҏ(gu)达不到目的的?span lang="EN-US">
修改Q?span lang="EN-US">
(1)(2?span lang="EN-US">)
void swap (int *x, int*y)
H?span lang="EN-US">
int t = *x;
*x = *y;
*y = t;
H?span lang="EN-US">
(2)(2?span lang="EN-US">)d?span lang="EN-US">
if(a>b) swap(&aQ?span lang="EN-US">&b);
if(a>c) swap(&aQ?span lang="EN-US">&c);
if(b>c) swap(&bQ?span lang="EN-US">&c);
3、假讄lؓ(f)基本整型量分?span lang="EN-US">2个字节,为字W型量分?span lang="EN-US">1个字节。下列程序完成的功能是什?span lang="EN-US">?(3?span lang="EN-US">)
# include
union
H?span lang="EN-US">
int n;
char ch [2];
H?span lang="EN-US">u;
void main ()
H?span lang="EN-US">
int m;
scanf (?d?/span>Q?span lang="EN-US">&m);
u.n = m;
printf (“\n%u, %u?/span>Q?span lang="EN-US">u.ch[0], u.ch[1]);
H?span lang="EN-US">
//该程序的功能Q取用户输入的整数值的高字节和低字节,q按照Q意整数的低字节和高字节分别输出?span lang="EN-US">
三、程序设计题(12?span lang="EN-US">)
假设一个文本文件中保存着100个整敎ͼ请将q?span lang="EN-US">100个整数按从小到大的顺序写到另一个文本文件中去,q且在新文g中每10个整数占一行。源文g名和目标文g名通过命o(h)行参数获取?span lang="EN-US">
分数分配Q?span lang="EN-US">
变量定义 2?span lang="EN-US">
命o(h)行参数处?span lang="EN-US"> 1?span lang="EN-US">
文g打开 1?span lang="EN-US">
文g?span lang="EN-US"> 2?span lang="EN-US">
排序 3?span lang="EN-US">
文g?span lang="EN-US"> 2?span lang="EN-US">
文g关闭 1?span lang="EN-US">
# include
void main(int argc, char *argv[])
H?span lang="EN-US">
FILE *fin, *fout;
Int a [100], i, j, t;
if(argc!=3)
H?span lang="EN-US">
printf (?You forgot to enter a filename\n?;
return;
H?span lang="EN-US">
fin = fopen (argv[1], “r?;
fout = fopen (argv[2], “w?;
for (i = 0; i<100; i++)
fscanf (fin, ?d? &a[i]);
for (i = 0; i<99; i++)
for (i = 0; i<99-i; i++)
if (a[j]>a[j+1])
H?span lang="EN-US">t = a[j]; a[j] = a[j+1]; a[j+1]=t;H?span lang="EN-US">
for (i = 0; i<100; i++)
H?span lang="EN-US">
if (i%10 = 0)
fprintf (fout, ?s? “\n?;
fprintf (fout, ?d? a[i]);
H?span lang="EN-US">
fclose (fin);
fclose (fout);
H?span lang="EN-US">
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