实验三

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

void print_text(int line, int co1, char text[]);
void print_spaces(int n);
void print_blank_lines(int n);

int main(){
    int line, co1, i;
    char text[N] = "hi,April~";
    
    srand(time(0));
    
    for(i=1;i<=10;i++){
        line=rand()%25;
        co1=rand()%80;
        print_text(line, co1,text);
        Sleep(1000);
    }
    return 0;
}

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

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

void print_text(int line, int co1, char text[]){
    print_blank_lines(line-1);
    print_spaces(co1-1);
    printf("%s",text);
}

隔一段距离打印一段特定文字

#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! = %11d\n",i,fac(i));
        
    return 0;
}

long long fac(int n){
    static long long p=1;
    
    p=p*n;
    printf("p=%11d\n",p);
    return p;
}

#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;
}

一致的

static变量可以固定一个数值的变化后的量。

#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=%11d\n", n, f);
    }
    
    return 0;
}

long long func(int n){
    int i;
    long long f = 1;
    for(i=1;i<=n;i++)
        f=2*f;
    return f-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 ans;
    if (n < m)
        return 0;
    else if (n == m || m == 0)
        return 1;
    else {
        return  func(n - 1, m - 1) + func(n - 1, m);
    }
}

#include <stdio.h>
double mypow(int x, int y); 
int main() {
    int x, y;
    double ans;
    while (scanf("%d%d", &x, &y) != EOF) {
        ans = mypow(x, y); 
        printf("%d的%d次方: %g\n\n", x, y, ans);
    }
    return 0;
}
double mypow(int x, int y)
{
    double ans=1;
    if (y >= 0)
    {
        for (int i =1; i <= y; i++)
        {
            ans = ans * x;
        }
    }
        else
    {
        for (int i = 1; i <= (-y); i++)
        {
            ans = ans / x;
        }
    }
    return ans;
}

#include <stdio.h>
#include <math.h>
int mypow(int x,int y);
int main() {
    int x, y;
    double ans;
    
    while(scanf("%d%d", &x, &y) != EOF) {
        ans = mypow(x, y);        
        printf("%d的%d次方: %g\n\n", x,y,ans);   
    }

    return 0;
} 
int mypow(int x, int y){
    int i;
    double s=1;
    if(y>0){
    for(i=1;i<=y;i++)
        s=s*x;
    }
    else
    for(i=1;i<=(-y);i++)
        s=s/x;
    return(s);
}

#include<stdio.h>
void hanoi(int n,char from,char temp,char to);
void moveplate(int n, char from, char to);
int i=0;
int main(){
    int n, i=0;
    while(scanf("%u",&n)!=EOF)
    hanoi(n,'A','B','C');
    printf("一共移动了%d次\n",i);
    return 0;
}

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

#include <stdio.h>
#include <math.h>
int is_prime(int n); 
int main(){
    int even;
    even = 1;
    for (even = 1; even < 21; even++)
    {
        for (int i = 1; i <= even / 2; i += 2)
            if (is_prime(i) && is_prime(even - i))
                printf("%d=%d+%d\n", even, i, even - i);
    }
    return 0;
}

int is_prime(int n)
{
    if (n == 1)
        return 0;
    int temp = (int)sqrt(n);
    for (int i = 2; i <= temp; i++)
        if (n % i == 0)
            return 0;
    return 1;
}

#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 nuber is: %d\n\n", t);
        printf("Enter a number: ");
    }
    return 0;
}

long func(long s){
     int   d;
    long  sl = 1;
    long t = 0;
    while (s > 0)
    {
        d = s % 10;
        if (d % 2 != 0)
        {
            t = d * sl + t;
            sl *= 10;
        }

        s /= 10;
    }
    return t;
}