实验三

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <windows.h>
#define N 80
void print_text(int line, int col, char text[]); // 函数声明
void print_spaces(int n); // 函数声明
void print_blank_lines(int n); // 函数声明
int main() {
int line, col, i;
char text[N] = "hi, April~";
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); 
}
 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); // 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
}

随机在行，列处打印文字

#include <stdio.h>
long long fac(int n); // 函数声明
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;
} // 函数定义
long long fac(int n) {
static long long p = 1;

p = p * n;
return p;
}

#include <stdio.h>
long long fac(int n); // 函数声明
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;
} // 函数定义
long long fac(int n) {
static long long p = 1;
 printf("p = %lld\n", p);
p = p * n;
return p;
}

#include <stdio.h>
int func(int, int); // 函数声明
int main() {
int k = 4, m = 1, p1, p2;
p1 = func(k, m); // 函数调用
p2 = func(k, m); // 函数调用
printf("%d, %d\n", p1, p2);
return 0;
} /
/ 函数定义
int func(int a, int b) {
static int m = 0, i = 2;
i += m + 1;
m = i + a + b;
return m;
}

只在第一次被调用时赋值

#include <stdio.h>
long long func(int n); // 函数声明
int main() {
int n;
long long f;
while (scanf("%d", &n) != EOF) {
f = func(n); // 函数调用
printf("n = %d, f = %lld\n", n, f-1);
} return 0;
}

long long func(int n){
    int m=0 ;
        if (n==0) m=1;
        else m=2*func(n-1);
        return m;}

#include <stdio.h>
#include<stdlib.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;
    int i=1;
    if (y>=0){
        for (i=1;i<=y;i++){
            ans=ans*x;}
    }
    else{
        for (i=1;i<=-y;i++){
            ans=ans/x;}
    }
    return ans;
}

 

#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){
static int q=0;
if (n<m) {
q=0;
return q;
}
else if (n==m){
q=1;
return q;
}
else{
if (n-m<m) m=n-m;
if (m==1) q=n;
else if (m==0) q=1;
else {
q=func(n-1,m)+func(n-1,m-1);}
return q;
}
}

 

#include <stdio.h>
#include<stdlib.h>
double mypow(double x,double 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(double x,double y){
    double ans=1;
    if (y>0){
    if (y==1) ans=x;
    else ans=x*mypow(x,y-1);
    }
    else {
        if (y==-1) ans=1/x;
        else ans=mypow(x,y+1)/x;
    }
    return ans;
}

#include <stdio.h>
void hanoi(unsigned int n,char from,char temp,char to );
void moveplate(unsigned int n,char from,char to);
static int ans=0;
int main() {
unsigned int n;
while(scanf("%u", &n) != EOF) {
    ans=0;
    hanoi(n,'A','B','C');
    printf("一共移动了%d次\n",ans);
}
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);
    ans+=1;
    
}

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



int main() {
    for (int i=2;i<=20;i+=2){
        for (int m=2;m<=i/2;m++){
            if (is_prime(m)==1&&is_prime(i-m)==1){
                printf("%d=%d+%d\n",i,m,i-m);
                break;}
        }
    }
    system("pause");
return 0;
}

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

#include<stdlib.h>
#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); // 函数调用

 printf("new number is: %ld\n\n", t);
 printf("Enter a number: ");
 }
return 0;
}

long func(long s){
    int q=0;
    int n=s%10;
    long m=0;
    while (s!=0){
        n=s%10;
        s=s/10;
        if (n%2==1) {
            m=n*pow(10*1.0,q)+m;
            q++;
        }
    }
    return m;
}