实验3

实验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));//以当前系统时间作为随机种子
    
    for(i = 1;i<=10;++i){
        line = rand() % 25;
        col = rand() % 80;
        print_text(line, col, text);
        Sleep(1000);//暂停1000ms 
    } 
    return 0;
}

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

//打印n行空白行
void print_blank_lines(int n){
    int i;
    for(i = 1;i<=n;++i)
    printf("\n");
} 

//在第line行第col列打印一段文本
void print_text(int line, int col, char text[]){
    print_blank_lines(line-1);    //打印line-1行空行 
    print_spaces(col-1);          //打印col-1列空格 
    printf("%s",text);            //在第line行col列输出text中字符串 
} 

 

实验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;
}

实验2.2

#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;
}

实验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){
    if(n==1)
    return 1;
    
    return (func(n-1)+1)*2-1;
}

 

实验4

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

 

5

#include<stdio.h>
#include<stdlib.h>

void move(int n,char A,char B,char C);

int main()
{
    int n;
    char A, B, C;
    while(scanf("%d",&n)!=EOF){
        int step = 0;
        move(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");
    }
    return 0;
}

void move(int n,char A,char B,char C){
    if(n==1)
       printf("%d:%c-->%c\n",n,A,C);
    
    else{
       move(n-1, 'A','C','B');
       printf("%d:%c-->%c\n",n,A,C);
       move(n-1,'B','A','C');
    }
}

#include<stdio.h>
#include<stdlib.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 x, y, t;
    t = 0;
    while(s!=0){
        x = s%10;
        if(x%2!=0)
          t = t*10+x;
          s = s/10;
    }
    y = t;
    t = 0;
    while(y!=0){
        x = y%10;
        t = t*10+x;
        y = y/10;
    }
    return t;
}