task1

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
 int main()
 {
     printf(" O \n");
     printf("<H>\n");
     printf("I I\n");
     return 0;
      }

#define _CRT_SECURE_NO_WARNINGS
#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>
#include <stdlib.h>
int main()
{
      printf(" O      O\n");
      printf("<H>    <H>\n");
      printf("I I    I I\n");
      system("pause");
            return 0;
 }

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int a, b, c;
    scanf("%d%d%d", &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");
    system("pause");
    return 0;
 }

#include <stdio.h>
#include <stdlib.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'||'Y') && (ans2=='y'||'Y'))// 待补足，判断用户回答ans1和ans2都是小写y或大写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");
   
    system("pause");
     return 0;
}

#include <stdio.h>
#include <stdlib.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 = %lf, y = %lf\n", x, y);
    system("pause");
    return 0;
 }

#include <stdio.h>
#include<stdlib.h>
int main()
{
    int year; 
    double second = 1e9;
    double t = ((second / 3600) / 24) / 365;
    if (t - (int)t < 0.5) {
    year = (int)t;
    }
    else {
    year = (int)t + 1;
    }
    printf("10亿秒约等于%d年\n", year);
    system("pause");
    return 0;
}

#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;    
} 

#define _CRT_SECURE_NO_WARNINGS
#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()
{
    float c,f;
    
    while(scanf("%f",&c) != EOF){
        
        f = 9*c/5 +32;
        printf("摄氏度c = %.2f时 华氏度f = %.2f\n\n",c,f); 
    }
     
    return 0;
}

#include <stdio.h>
#include <math.h>
int main()
{
    int a,b,c;
    double s,area;
     
    while(scanf("%d%d%d",&a,&b,&c) != EOF){
        s = ((double)a+(double)b+(double)c)/2;
        area = sqrt(s*(s-a)*(s-b)*(s-c));
        printf("a = %d b = %d c = %d area = %.3lf ",a,b,c,area);
        
    }
     
return 0;
}