实验2

task1

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

#define N 5
#define R1 586
#define R2 701

int main()
{
    int number;
    int i;
    
    srand( time(0) );
    
    for(i = 0;i < N;++i)
    {
        number = rand() % (R2 - R1 + 1) + R1;
        printf("20228330%04d\n",number);
    }
    
    return 0;
}

 

 task2

#include <stdio.h>

int main()
{
    double x, y;
    char c1, c2, c3;
    int a1, a2, a3;
    scanf("%d%d%d", &a1, &a2, &a3);
    printf("a1 = %d, a2 = %d, a3 = %d\n", a1, a2, a3);
    
    scanf("%c%c%c", &c1, &c2, &c3);
    printf("c1 = %c, c2 = %c, c3 = %c\n", c1, c2, c3);
    
    scanf("%f%lf", &x, &y);
    printf("x = %f, y = %lf\n",x, y);
    
    return 0;
}

 

 task3-1

#include <stdio.h>
#include <math.h>

int main()
{
    double x, ans;
    
    scanf("%lf", &x);
    ans = pow(x, 365);
    printf("%.2f的365次方： %.2f\n", x, ans);
    
    return 0;
 } 

 

 

 

 

 

 

 task3-2

#include <stdio.h>
#include <math.h>

int main()
{
    double x, ans;
    
    while(scanf("%lf", &x) != EOF)
    {

    ans = pow(x, 365);
    printf("%.2f的365次方： %.2f\n", x, ans);
    printf("\n");
    }
    
    return 0;
 } 

 

 task3-3

#include <stdio.h>
#include <math.h>

int main()
{
    double c, f;
    
    while(scanf("%lf", &c) != EOF)
    {

    f = (9/5)*c + 32;
    printf("摄氏度c = %.2f时，华氏度f = %.2f\n", c, f);
    printf("\n");
    }
    
    return 0;
 } 

 

 

task4

#include <stdio.h>
#include <math.h>

int main()
{
    int C;
    
    while(scanf("%c", &C) != EOF)
    {
    switch(C){   
    case 'y':printf("wait a minute\n");
    getchar();break;
    case 'g':printf("go go go\n");
    getchar();break;
    case 'r':printf("stop!\n");
    getchar();break;
    default:printf("something must be wrong\n");
    getchar();break;}
    }
    
    return 0;
 } 

 

 task5

#include <stdio.h> 
#include <stdlib.h>
#include <time.h>
int main()
{
    
    int lucky_day,guess_day,i;
    srand( time(0) );
    
    lucky_day=rand() % 30 + 1;
    printf("猜猜2023年4月哪一天会是你的lucky_day\n\n");
    printf("开始喽，你有三次机会，猜吧(1~30):");
    for(i=1;i<4;i++){
    scanf("%d",&guess_day);
    if(lucky_day>guess_day){
      printf("你猜的日期早了，你的lucky_day还没到呢\n");
      printf("再猜（1~30）："); 
     }
    else{
        if(lucky_day<guess_day){
            printf("你猜的日期晚了，你的lucky_day已经过啦\n");
            printf("再猜（1~30）：");}
        else
            {printf("哇，猜中了:-)");break;}
    }
}
    if(lucky_day==guess_day)
    printf("\t\t");
    else
    printf("次数用完啦。偷偷告诉你：4月，你的lucky_day是%d号",lucky_day);
    
    
    return 0;
}

 

 

 

 

 

task6

#include <stdio.h>

int main()
{
    int n,m;
    for(n=1;n<=9;n++)
    {
        for(m=1;m<=n;m++)
        {
            printf("%dx%d=%d\t",m,n,m*n);
        }
        printf("\n");
    }
    return 0;
    
}

 

 task7

#include <stdio.h>

int main()
{
    int i,j;
    int n,m,l,p,t=1;
    m = 2*n-1;
    l=n;
    printf("input:");
    scanf("%d",&n);
    for(i=1;i<=n;n--)
    {  
        m=2*n-1;
        for(p=1;p<=t;p++) 
        {
            printf("\t");
        }
        for(j=1;j<=m;j++)
        {
            printf(" O\t");
        }
        printf("\n");
        for(p=1;p<=t;p++) 
        {
            printf("\t");
        }
        
        for(j=1;j<=m;j++)
        {
            printf("<H>\t");
        }
        printf("\n");
        for(p=1;p<=t;p++) 
        {
            printf("\t");
        }
        
        for(j=1;j<=m;j++)
        {
            printf("I I\t");
        }
    
        printf("\n");
        t=t+1;
        }
    
    
    
    
    
    
    
    
    return 0;
}