实验1

#include <stdio.h>
int main()
{
    printf(" o \n");
    printf("<H>\n");
    printf("I I\n");
    

    return 0 ;
}

#include <stdio.h>
int main()
{
    printf(" o \n");
    printf("<H>\n");
    printf("I I\n");
    printf(" o \n");
    printf("<H>\n");
    printf("I I\n");

    return 0;
}

#include<stdio.h>
int main()
{
    printf(" o\to\n");
    printf("<H>\t<H>\n");
    printf("II\tII\n");
    
    
    return 0;
    
}

#include <stdio.h>

int main()
{
      int n, sum;
      
      scanf("%d", &n);
      
      
       sum = n/2*(n+1);
       printf("sum = %d\n", sum);
       return 0;
}

#include <stdio.h>
int main()
{
    int a, b, t;
       a = 3;
       b = 4;
       printf("a = %d, b = %d\n", a, b);
       t = a;
       a = b;
       b = t;
       printf("a = %d, b = %d\n", a, b);
       

       return 0;
}

#include <stdio.h>

int main()
{
    int x, t, m;
    x = 123;
    printf("x = %d\n", x);
    t = 0;
    m = x % 10;
    t = t *10 + m;
    x = x / 10;
    m = x % 10;
    t = t * 10 + m;
    x = x / 10;
    m = x % 10;
    t = t * 10 + m;
    x = x / 10;
    printf("t = %d\n", t);
    return 0;
}

#include<stdio.h>

int main()
{float a,b,c;
    scanf("%f%f%f",&a,&b,&c);
    if(a+b>c&a+c>b&b+c>a)

       printf("能构成三角形\n");
    else
    
       printf("不能构成三角形\n");
    return 0;
 } 

#include<stdio.h>
int main()
{
     int year;
     year = 1000000000/60/60/24/365;
    printf("10亿秒约等于%d年\n", year);    
     
}

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

int main()
{
    int n;
    n=rand()%41+60;
    printf("n = %d\n", n);
    return 0;
}

#include <stdio.h>
int main()
{
char ans1, ans2;
printf("每次课前认真预习、课后及时复习了没? (输入y或Y表示有，输入n或N表示没有) : ");
ans1 = getchar(); 
getchar(); 
printf("\n动手敲代码实践了没? (输入y或Y表示敲了，输入n或N表示木有敲) : ");
ans2 = getchar();
if((ans1 == 'y' || ans1 == 'Y') && (ans2 == 'y' || ans2 == 'Y'))
printf("\n罗马不是一天建成的, 继续保持哦:)\n");
else
printf("\n罗马不是一天毁灭的, 我们来建设吧\n");
return 0;
}