#include<stdio.h>
int main()
{
    double x,y;
    char c1,c2,c3;
    int a1,a2,a3;
    scanf("%d%d%d",&a1,&a2,&a3);
    printf("%d,%d,%d\n",a1,a2,a3);
    scanf("%c%c%c",&c1,&c2,&c3);
    printf("%c%c%c\n",c1,c2,c3);
    scanf("%lf,%lf",&x,&y);
    printf("%lf,%lf\n",x,y);
    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;
    }

 

#include<stdio.h>
int main()
{
    int  a1, a2;
    char c1, c2;
    scanf("%d%c%d%c", &a1, &c1, &a1, &c2);
    printf("a1=%d,a2=%d\n", a1, a2);
    printf("c1=%c,c2=%c\n", c1, c2);
    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;
}

 除法运算后取整

#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()
{
    printf(" O\n");
    printf(" H\n");
    printf("I I\n\n");

    
    printf(" O\n");
    printf(" H\n");
    printf("I I\n");

    return 0;
}

 

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

    
    

    return 0;
}