c语言程序阅读题目(带解释)

阅读程序模拟题

1．下面程序执行结果是

#include

void swap(int *,int *);

void main()

{

int a=5, b=7, *ptr1, *ptr2;

ptr1=&a, ptr2=&b;

swap (ptr1,ptr2);

printf(“*ptr1=%d,*ptr2=%d\n”,*ptr1,*ptr2);

printf(“a=%d,b=%d\n”,a,b);

}

void swap (int *p1, *p2)

{

int p;

p=*p1;

*p1=*p2;

*p2=p;

}

2．输入we are students ，下面程序运行结果3

#include *（求输入的单词数）

void main()

{ char string[81];

int i,num=0,word=0;

char c;

gets(string);

for(i=0;(c=string[i])!='\0';i++)

if(c==' ') word=0;

else if(word==0)

{

word=1;

num++;

}

printf(" %d\n",num);

}

3．下面程序的运行结果是 2 4 5 7 6 0 11 9 7 3

#include （求已输入数据的反置式子）void inv(int x[], int n);

void main()

{ int i,a[10]={3,7,9,11,0,6,7,5,4,2};

inv(a,10);

printf("The array has been reverted:\n");

for(i=0;i<10;i++)

printf("%d,",a[i]);

}

void inv(int x[], int n)

{ int t,i,j,m=(n-1)/2;

for(i=0;i<=m;i++)

{

j=n-1-i;

t=x[i];

x[i]=x[j];

x[j]=t;

}

}

4．下面程序的运行结果是char *a=I am a teacher

char *b=I am a teacher #include

void copy_string(char *,char *);

void main()

{ char *a="I am a teacher.";

char *b="You are a student.";

copy_string(a,b);

printf("\nstring_a=%s\nstring_b=%s\n",a,b);

}

void copy_string(char *from,char *to)

{ for(;*from!='\0';from++,to++)

*to=*from;

*to='\0';

}

5．下面程序的运行的功能是BASIC

Computer

FORTRAN

Follow me

Great Wall

（按从小到大排列单词）

#include

#include

void sort(char *name[],int );

void print(char *name[],int);

void main()

{

char *name[]={"Follow me","BASIC",

"Great Wall","FORTRAN","Computer "};

int n=5;

sort(name,n);

}

void sort(char *name[],int n)

{ char *temp;

int i,j,k;

for(i=0;i

{ k=i;

for(j=i+1;j

if(strcmp(name[k],name[j])>0（若换成<0则是按从大到小）) k=j;

if(k!=i)

{

temp=name[i];

name[i]=name[k];

name[k]=temp;}

}

}

void print(char *name[],int n)

{

int i;

for(i=0;i

puts(name[i]);

}

6. 输入5回车后，下面程序的执行结果是 120

#include（求阶乘）

long int fac(int );

void main()

{

int n;

scanf("%d",&n);

printf("%d\n",fac(n));

}

long int fac(int m)

{

long int f;

if(m<0)

printf("data error!\n");

else if(m==0||m==1)

f=1;

else

f=fac(m-1)*m;