实验1

task1.1c

 1 #include<stdio.h>
 2 int main()
 3 {
 4     printf(" O\n");
 5     printf("<H>\n");
 6     printf("I I\n");
 7     printf(" O\n");
 8     printf("<H>\n");
 9     printf("I I\n");
10     return 0;
11 }

task1.2c

 1 #include<stdio.h>
 2 int main()
 3 {
 4     printf(" O");
 5     printf("  O\n");
 6     printf("<H>");
 7     printf("<H>\n");
 8     printf("I I");
 9     printf("I I\n");
10     return 0;
11 }

task2c

 1 #include<stdio.h>
 2 int main()
 3 {
 4     double a, b, c;
 5     scanf("%lf%lf%lf",&a,&b,&c);
 6     if(a+b>c&&a+c>b&&b+c>a)
 7        printf("能构成三角形\n");
 8     else
 9        printf("不能构成三角形\n");
10        
11     return 0;
12 }

task3c

 1 #include<stdio.h>
 2 int main()
 3 {
 4     char ans1,ans2;
 5     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) :");
 6     ans1 = getchar();
 7     getchar();
 8     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) :");
 9     ans2 = getchar();
10     if((ans1 == 'y'||ans1 == 'Y')&&(ans2 == 'y'||ans2 == 'Y'))
11         printf("\n罗马不是一天建成的, 继续保持哦:)\n");
12     else
13         printf("\n罗马不是一天毁灭的, 我们来建设吧\n");
14         
15     return 0;
16 }

getchar()是为了读取回车键字符(\n)

task4c

 1  #include<stdio.h>
 2 int main()
 3  {
 4      double x, y;
 5      char c1, c2, c3;
 6      int a1 ,a2, a3;
 7      
 8      scanf("%d%d%d",&a1,&a2,&a3);                  //输入数据时在变量前应该加上定位符& 
 9      printf("a1 = %d,a2 = %d,a3 = %d\n",a1,a2,a3);
10      
11      scanf(" %c%c%c",&c1,&c2,&c3);
12      printf("c1 = %c,c2 = %c,c3 = %c\n",c1,c2,c3);
13      
14      scanf("%lf%lf",&x,&y);                        //double在输入时必须使用lf 
15      printf("x = %lf,y = %lf",x,y);        
16      return 0;
17  }

task5c

 1 #include<stdio.h>
 2 int main()
 3 {
 4     int year;
 5     float m;
 6     m = 1e9;
 7     year = m/(60*60*24*365);
 8     printf("10亿秒约等于%d年\n",year);
 9     return 0;
10 }

task6c

 1 #include<stdio.h>
 2 #include<math.h>
 3 int main()
 4 {
 5     double x,ans;
 6     while(scanf("%lf",&x) != EOF)
 7     {
 8         ans = pow(x,365);
 9         printf("%.2f的365次方：%.2f\n",x,ans);
10         printf("\n");
11     }
12     
13     return 0;
14 }

task7c

 1 #include<stdio.h>
 2 
 3 int main()
 4 {
 5     double C;
 6     while(scanf("%lf",&C) != EOF)
 7     {
 8         double F; 
 9         F = 1.8*C + 32;
10         printf("摄氏度c = %.2lf时，华氏度f = %.2lf\n",C,F);
11         printf("\n");
12     }
13     
14     return 0;
15 }

task8c

 1 #include<stdio.h>
 2 #include<math.h>
 3 int main()
 4 {
 5     double a,b,c;
 6     while(scanf("%lf%lf%lf",&a,&b,&c) != EOF)
 7     {
 8         double s; 
 9         s = (a+b+c)/2;
10         
11         double S;
12         S = sqrt(s*(s-a)*(s-b)*(s-c));
13         
14         printf("a = %.0lf,b = %.0lf,c = %.0lf,area = %.3lf\n",a,b,c,S);
15         printf("\n");
16     }
17     
18     return 0;
19 }