实验3

实验1源代码

#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);    
}

实验1运行结果

实验1代码功能

在根据时间作随机种子选出的随机数行除以25取余，列除以80取余，打出空格和换行后打出“hi,november!”

实验2.1源代码

#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;
}

实验2.1运行结果

实验2.2源代码

#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;
}

实验2.2运行结果

实验3源代码

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

实验3运行结果

 

实验4.1源代码

#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 i,x,c,y,l;
    for(i=n-m+1,x=1;i<=n;++i)
        x=x*i;
    for(l=1,y=1;l<=m;++l)
        y=y*l;
    c=x/y;
    return c;    
}

实验4.1运行结果

实验4.2源代码

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

实验4.2运行结果

 

实验5源代码

 

#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 main()
{
    unsigned int n;
    
    while (scanf("%d", &n) != EOF) 
    {
        int step = 0;
        hanoi(n, 'A', 'B', 'C');
        for (n; n > 0; n--) 
        {
            step = 2 * step + 1;
        }
        printf("\n");
        printf("一共移动了%d次\n", step);
        printf("\n");
    }

}
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);
}

实验5运行结果

 

实验6源代码

 

#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)
{
    int n;
    long sum = 0;
    while (s > 0) 
    {
        n = s % 10;
        if (n % 2 != 0) 
        {
            sum = sum * 10 + n;
        }
        s /= 10;
    }

    return sum;
}

实验6运行结果