实验3_C语言函数应用编程

1.task_1

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <windows.h>
#define N 80

void print_text(int line,int col,char text[]);
void print_spaces(int n);
void print_blank_lines(int n);

int main()
{
    int line,col,i;
    char text[N]="hi,November~";
    srand (time(0));
    for (i=1;i<=10;++i)
    {
        line=rand()%25;
        col=rand()%80;
        print_text(line,col,text);
        Sleep(1000);
    }
    return 0;
}

void print_spaces(int n)
{
    int i;
    for (i=1;i<=n;++i)
        printf(" ");
}

void print_blank_lines(int n)
{
    int i;
    for (i=1;i<=n;++i)
        printf("\n");
}

void print_text(int line,int col,char text[])
{
    print_blank_lines(line-1);
    print_spaces(col-1);
    printf("%s",text);
}

答：下“hi,November~”雨，总计10个

 

2.task_2

  (1)

#include <stdio.h>
long long fac(int n);

int main()
{
    int i,n;
    printf("Enter n:");
    scanf("%d",&n);
    for (i=1;i<=n;++i)
        printf("%d!=%lld\n",i,fac(i));
    return 0;
} 

long long fac(int n)
{
    static long long p=1;
    //printf("p=%lld\n",p);
    p=p*n;
    return p;
}

(2)

#include <stdio.h>
int func(int,int);

int main()
{
    int k=4,m=1,p1,p2;
    p1=func(k,m);
    p2=func(k,m);
    printf("%d,%d\n",p1,p2);
    return 0;
}

int func(int a,int b)
{
    static int m=0,i=2;
    i+=m+1;
    m=i+a+b;
    return m;
}

答：与分析一致。static定义答变量不随计算而改变

 

3.task_3

#include <stdio.h>
long long func(int n);

int main()
{
    int n;
    long long f;
    while (scanf("%d",&n)!=EOF)
    {
        f=func(n);
        printf("n=%d,f=%lld\n",n,f);
    }
    return 0;
}

long long func(int n)
{
    long long int f=1;
    int i;
    for (i=1;i<=n;i++)
        f=f*2;
    f=f-1;
    return f;
}

 

4.task_4

(1）

#include <stdio.h>
int func(int n,int m);

int main()
{
    int n,m;
    while (scanf("%d%d",&n,&m)!=EOF)
        printf("n=%d,m=%d,ans=%d\n",n,m,func(n,m));
    return 0;
} 

int func(int n,int m)
{
    int up=1,down=1,i,ans;
    for (i=n-m+1;i<=n;i++)
        up=up*i;
    for (i=1;i<=m;i++)
        down=down*i;
    ans=up/down;
    return ans;
}

（2）

#include <stdio.h>
int func(int n,int m);

int main()
{
    int n,m;
    while (scanf("%d%d",&n,&m)!=EOF)
        printf("n=%d,m=%d,ans=%d\n",n,m,func(n,m));
    return 0;
} 

int func(int n,int m)
{
    int ans;
    if (m==0)
        ans=1;
    else if (m==1)
        ans=n;
    else if (m==n)
        ans=1; 
    else if (m>n)
        ans=0;
    else
        ans=func(n-1,m)+func(n-1,m-1);
    return ans;
}

 

5.rask_5

#include <stdio.h>
#include <stdlib.h>
void hanoi(unsigned int n,char from,char temp,char to);
void moveplate(unsigned int n,char from,char to);
int count;

int main()
{
    unsigned int n;
    while(scanf("%u",&n)!=EOF)
    {
        count=0;
        hanoi(n,'A','B','C');
        printf("\n");
        printf("一共移动了%d次.\n",count);
        printf("\n");
    }
    return 0;
}

void hanoi(unsigned int n,char from,char temp,char to)
{
    if (n==1)
       moveplate(n,from,to);
    else
    {
        hanoi(n-1,from,to,temp);
        moveplate(n,from,to);
        hanoi(n-1,temp,from,to);
    }
}

void moveplate(unsigned int n,char from,char to)
{
    printf("%u:%c-->%c\n",n,from,to);
    count++;
}

 

6.task_6

#include <stdio.h>
#include <math.h>
long func(long s);

int main()
{
    long s,t;
    printf("Enter a number:");
    while (scanf("%ld",&s)!=EOF)
    {
        t=func(s);
        printf("new number is:%ld\n\n",t);
        printf("Enter a number:"); 
    }
    return 0;
}

long func(long s)
{
    long k=0,m,t=0,n;
    do
    {
        m=s%10;
        if (m%2==1)
        {
            k=k*10+m;
        }
        s=s/10;
    }while (s!=0);
    do
    {
        n=k%10;
        t=t*10+n;
        k=k/10;
    }while (k!=0);
    return t;
}

 

7.task_7

#include <stdio.h>
#define N 10

int main()
{
    int a=1,list[N]={0},m,n,i,k,t,f;
    while (a!=EOF)
    {
        i=0,f=1;
        m=a*a*a,n=a*a;
        do
        {
            list[i]=m%10;
            m/=10;
            i++;
        }while (m!=0);
        do
        {
            list[i]=n%10;
            n/=10;
            i++;
        }while (n!=0);
        for (k=0;k<=N-2;k++)
        {
            for (t=k+1;t<=N-1;t++)
            {
                if (list[k]==list[t])
                {
                    f=0;
                    break;
                }
            }
        }
        if (f==1)
            break;
        else
            a++;
    }
    printf("%d\n",a);
    return 0;
}