实验3

task1

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,Noverber~";
    
    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);
}

结果

功能

随机生成10个位置的“hi,Noverber~”

task2_1

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;
    
    p = p*n;
    
    return p;
}

#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;
}

结果

task2_2

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;
}

结果

特性：static变量只能初始化一次，生命周期为整个程序的运行期间。

task3

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

结果

task4_1

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

结果

task4_2

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

结果

task5

代码

#include<stdio.h>
void han(unsigned int n,char from,char temp,char to);
void move(unsigned int n,char from,char to);

int main(){
    unsigned int n;
    while(scanf("%u",&n)!=EOF){
        han(n,'A','B','C');        
    }
    return 0;
}

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

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

结果

task6

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 i,y;
    long k=0,j=0;
    while(s!=0){
        i=s%10;
        if(i%2!=0){
            k=k*10+i;
        }
        s=s/10;
    }
    while(k!=0){
        y=k%10;
        j=j*10+y;
        k=k/10;
    }
    return j;
}

结果

task7

代码

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

int main(){
    int n;
    for(n=1;n>0;n++){
        if(check(n)){
            printf("%d",n);
            break;
        }
    }    
    return 0;
} 

int check(int n){
    int a=n*n;
    int b=n*n*n; 
    int d[10]={0};
    int i;
    
    while(a!=0){
        d[a%10]++;
        a/=10;
    }
    while(b!=0){
        d[b%10]++;
        b/=10;
    }
    for(i=0;i<10;i++){
        if(d[i]!=1){
            return 0;
        }
    }
    
    return 1; 
}

结果