实验3_C语言函数应用编程

1.task_1

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <time.h>
 4 #include <windows.h>
 5 #define N 80
 6 
 7 void print_text(int line,int col,char text[]);
 8 void print_spaces(int n);
 9 void print_blank_lines(int n);
10 
11 int main()
12 {
13     int line,col,i;
14     char text[N]="hi,November~";
15     srand (time(0));
16     for (i=1;i<=10;++i)
17     {
18         line=rand()%25;
19         col=rand()%80;
20         print_text(line,col,text);
21         Sleep(1000);
22     }
23     return 0;
24 }
25 
26 void print_spaces(int n)
27 {
28     int i;
29     for (i=1;i<=n;++i)
30         printf(" ");
31 }
32 
33 void print_blank_lines(int n)
34 {
35     int i;
36     for (i=1;i<=n;++i)
37         printf("\n");
38 }
39 
40 void print_text(int line,int col,char text[])
41 {
42     print_blank_lines(line-1);
43     print_spaces(col-1);
44     printf("%s",text);
45 }

答：下“hi,November~”雨，总计10个

2.task_2

  (1)

 1 #include <stdio.h>
 2 long long fac(int n);
 3 
 4 int main()
 5 {
 6     int i,n;
 7     printf("Enter n:");
 8     scanf("%d",&n);
 9     for (i=1;i<=n;++i)
10         printf("%d!=%lld\n",i,fac(i));
11     return 0;
12 } 
13 
14 long long fac(int n)
15 {
16     static long long p=1;
17     //printf("p=%lld\n",p);
18     p=p*n;
19     return p;
20 }

(2)

 1 #include <stdio.h>
 2 int func(int,int);
 3 
 4 int main()
 5 {
 6     int k=4,m=1,p1,p2;
 7     p1=func(k,m);
 8     p2=func(k,m);
 9     printf("%d,%d\n",p1,p2);
10     return 0;
11 }
12 
13 int func(int a,int b)
14 {
15     static int m=0,i=2;
16     i+=m+1;
17     m=i+a+b;
18     return m;
19 }

答：与分析一致。static定义答变量不随计算而改变

3.task_3

 1 #include <stdio.h>
 2 long long func(int n);
 3 
 4 int main()
 5 {
 6     int n;
 7     long long f;
 8     while (scanf("%d",&n)!=EOF)
 9     {
10         f=func(n);
11         printf("n=%d,f=%lld\n",n,f);
12     }
13     return 0;
14 }
15 
16 long long func(int n)
17 {
18     long long int f=1;
19     int i;
20     for (i=1;i<=n;i++)
21         f=f*2;
22     f=f-1;
23     return f;
24 }

4.task_4

(1）

 1 #include <stdio.h>
 2 int func(int n,int m);
 3 
 4 int main()
 5 {
 6     int n,m;
 7     while (scanf("%d%d",&n,&m)!=EOF)
 8         printf("n=%d,m=%d,ans=%d\n",n,m,func(n,m));
 9     return 0;
10 } 
11 
12 int func(int n,int m)
13 {
14     int up=1,down=1,i,ans;
15     for (i=n-m+1;i<=n;i++)
16         up=up*i;
17     for (i=1;i<=m;i++)
18         down=down*i;
19     ans=up/down;
20     return ans;
21 }

（2）

 1 #include <stdio.h>
 2 int func(int n,int m);
 3 
 4 int main()
 5 {
 6     int n,m;
 7     while (scanf("%d%d",&n,&m)!=EOF)
 8         printf("n=%d,m=%d,ans=%d\n",n,m,func(n,m));
 9     return 0;
10 } 
11 
12 int func(int n,int m)
13 {
14     int ans;
15     if (m==0)
16         ans=1;
17     else if (m==1)
18         ans=n;
19     else if (m==n)
20         ans=1; 
21     else if (m>n)
22         ans=0;
23     else
24         ans=func(n-1,m)+func(n-1,m-1);
25     return ans;
26 }

5.rask_5

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 void hanoi(unsigned int n,char from,char temp,char to);
 4 void moveplate(unsigned int n,char from,char to);
 5 int count;
 6 
 7 int main()
 8 {
 9     unsigned int n;
10     while(scanf("%u",&n)!=EOF)
11     {
12         count=0;
13         hanoi(n,'A','B','C');
14         printf("\n");
15         printf("一共移动了%d次.\n",count);
16         printf("\n");
17     }
18     return 0;
19 }
20 
21 void hanoi(unsigned int n,char from,char temp,char to)
22 {
23     if (n==1)
24        moveplate(n,from,to);
25     else
26     {
27         hanoi(n-1,from,to,temp);
28         moveplate(n,from,to);
29         hanoi(n-1,temp,from,to);
30     }
31 }
32 
33 void moveplate(unsigned int n,char from,char to)
34 {
35     printf("%u:%c-->%c\n",n,from,to);
36     count++;
37 }

6.task_6

 1 #include <stdio.h>
 2 #include <math.h>
 3 long func(long s);
 4 
 5 int main()
 6 {
 7     long s,t;
 8     printf("Enter a number:");
 9     while (scanf("%ld",&s)!=EOF)
10     {
11         t=func(s);
12         printf("new number is:%ld\n\n",t);
13         printf("Enter a number:"); 
14     }
15     return 0;
16 }
17 
18 long func(long s)
19 {
20     long k=0,m,t=0,n;
21     do
22     {
23         m=s%10;
24         if (m%2==1)
25         {
26             k=k*10+m;
27         }
28         s=s/10;
29     }while (s!=0);
30     do
31     {
32         n=k%10;
33         t=t*10+n;
34         k=k/10;
35     }while (k!=0);
36     return t;
37 }