实验一（刘梦婷）

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

return 0; } 

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

#include <stdio.h>
 int main() { int x, y;  
 int r1, r2, r3, r4;  
  x = 1; y = 2; 
  r1 = x + y; 
  r2 = x - y; 
  r3 = x * y; 
  r4 = x / y;
  printf("r1 = %d\n", r1); 
  printf("r2 = %d\n", r2); 
  printf("r3 = %d\n", r3); 
  printf("r4 = %d\n", r4); 
  return 0; 
  }

#include <stdio.h>
 int main() 
 { float x, y;  
 float r1, r2, r3, r4;  
  x = 1; y = 2; 
  r1 = x + y; 
  r2 = x - y; 
  r3 = x * y; 
  r4 = x / y;
  printf("r1 = %f\n", r1); 
  printf("r2 = %f\n", r2); 
  printf("r3 = %f\n", r3); 
  printf("r4 = %f\n", r4); 
  return 0; 
  }

#include <stdio.h>
 int main() 
 { int n, r1, r2, r3, r4; 
 n = 100;
 r1 = n*(n+1)/2; 
 r2 = (n+1)*n/2; 
 r3 = n/2*(n+1); 
 r4 = (n+1)/2*n; 
 printf("n = %d\n", n); 
 printf("r1 = %d\n", r1); 
 printf("r2 = %d\n", r2); 
 printf("r3 = %d\n", r3); 
 printf("r4 = %d\n", r4); 
 return 0; 
 }

#include <stdio.h>
 int main() 
 { int n, r1, r2, r3, r4; 
 n = 101;
 r1 = n*(n+1)/2; 
 r2 = (n+1)*n/2; 
 r3 = n/2*(n+1); 
 r4 = (n+1)/2*n; 
 printf("n = %d\n", n); 
 printf("r1 = %d\n", r1); 
 printf("r2 = %d\n", r2); 
 printf("r3 = %d\n", r3); 
 printf("r4 = %d\n", r4); 
 return 0; 
 }

#include <stdio.h>
 int main() 
 { int answer; 
 char words[5000];
  printf("网课学习让一些人欢喜一些人忧.\n"); 
  printf("1. 作为一个宅，社恐，觉得这样很好. 有网络，自主学习，很ok.\n"); 
  printf("2. 不喜，不喜，很不喜. 眼睛快瞎了. 脑壳有点卡...\n"); 
  printf("3. 中间派. 不知道. 说不清.\n"); 
  printf("4. 其它...\n"); 
  printf("你的选择: "); 
  scanf("%d", &answer); 
  if(answer == 4) { printf("请补充说明你的想法: \n"); 
  getchar(); 
   gets(words); 
 }
 printf("\n"); 
 printf("当遇到问题时, 你会选择:\n");
 printf("1. 遇到问题, 就解决问题。不懂的，搜索式学习，逐个攻破.\n"); 
 printf("2. 遇到问题, 不高兴。然后,...,没有了.\n");
 printf("3. 其它...\n"); 
 printf("你的选择: "); 
 scanf("%d", &answer);
 if(answer == 1) printf(":)\n"); 
 else if(answer == 2) printf("这样不能解决问题啊...我们选择1好不好:)\n"); 
 else if(answer == 3) { printf("请补充说明你的想法: \n"); 
 getchar(); 
  gets(words); 
   }
   return 0; }