实验2 C语言输入输出和控制语句应用编程

#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)); // 以当前系统时间作为随机种子
    for (i = 0; i < N; ++i)
    {
        number = rand() % (R2 - R1 + 1) + R1;
        printf("20228330%04d\n", number);
    }
    return 0;
}

1.line18的功能为在R1-R2之间生成随机数number

2.根据系统时间随机生成202283300586-202283300701之间的5个学号

实验2

#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("%lf%lf", &x, &y);//
printf("x = %f, y = %lf\n",x, y);
return 0;
}

实验3

#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;
}

#include <stdio.h>
#include <math.h>
int main()
{
double C, F;
while(scanf("%lf", &C) != EOF)
{
F = 9*C/5+32;
printf("摄氏度C = %.2f时，华氏度F =  %.2f\n", C, F);
printf("\n");
}
return 0;
}

实验4

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

实验5

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
    int a,i,b;
    i=1;
    srand((unsigned)time(NULL));
    a = rand()%(30-1+1)+1;
    printf("猜猜2023年4月哪一天会是你的lucky day\n\n开始喽，你有三次机会，猜吧（1~30）：");
    while(i<=3||b==a)
    {
        scanf("%d",&b);
        if(b==a)
        printf("哇，猜中了:-)\n\n");
        else if(b>a)
        printf("你猜的日期晚了，你的lucky day已经过啦\n\n");
        else if(b<a)
        printf("你猜的日期早了，你的lucky day还没到呢\n\n");
        if(i<3&&a!=b)
        printf("再猜(1~30):");
        i+=1;
    }
    if(i>3)
    printf("次数用完啦，偷偷告诉你:4月，你的lucky day是%d号\n\n",a);
    return 0;
    
    
    
}

实验6

#include <stdio.h>
int main()
{
    int c,l,v;
    l=1;
    while(l<=9)
    {
        c=1;
        while(c<=l)
        {
            v=c*l;
            printf("%dx%d = %d",c,l,v);
            if(c==l)
            printf("\n\n");
            else
            printf(" ");
            c+=1;
        }
        l+=1;
    }

    return 0;
    
    
    
}

实验7

#include <stdio.h>

int main()
{
    int l,n,k,a,b,i,p;
    printf("input n

:");
    scanf("%d",&l);
    
    i=1;
    
    while(l>=1)
    {
        a=l+l-1;
        b=l+l-2;
        n=k=p=1;
        
        
        
        while(n<=a)
        {
            while(p<i)
            {
                printf("       ");
                p++;
            }
            
            printf(" O ");
            if(k<=b)
              printf("    ");
            else
                printf("\n");
                
            
                
        
            n++; 
            k++;
            
        }
        
        n=k=p=1;
        
        
        while(n<=a)
        {
            while(p<i)
            {
                printf("       ");
                p++;
            }
            
            printf("<H>");
            if(k<=b)
              printf("    ");
            else
                printf("\n");
                
            
                
        
            n++; 
            k++;
            
        }
        
        
        n=k=p=1;
        
        while(n<=a)
        {
            while(p<i)
            {
                printf("       ");
                p++;
            }
            
            printf("I I");
            if(k<=b)
              printf("    ");
            else
                printf("\n\n");
                
            
                
        
            n++; 
            k++;
            
        }
        
        
        
        
        
        l--;
        i++;
    
    }
    
    return 0;
    
}