实验二 C语言分支与循环基础应用

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4  
 5 #define N 5
 6 #define N1 374
 7 #define N2 465
 8  
 9 int main()
10 {
11     int number;
12     int i;
13      
14     srand(time(0));
15      
16     for(i=0;i<N;++i){
17         number = rand()%(N2-N1+1)+N1;
18         printf("202383290376%04d\n",number);
19     }
20     return 0;
21 } 

 1 #include<stdio.h>
 2 
 3  int main()

 4  {
 5      char x;
 6      
 7      while(scanf("%c",&x)!=EOF){
 8        getchar();
 9        switch(x){
10        
11         case 'r':printf("stop!\n");break;
12         case 'g':printf("go go go\n");break;
13         case 'y':printf("wait a minute\n");break;
14         default :printf("something must be wrong\n");break;
15     }}
16     return 0;}

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4  
 5  int main()
 6  {
 7      int x,y,i,z;
 8      srand(time(0));
 9      y=rand()%30+1;
10     z=0;
11     printf("猜猜2023年11月哪一天是你的lucky day\n开始喽，你有三次机会，猜吧（1~30）：");
12     
13     for (i=0;i<3;++i){
14     scanf("%d",&x);
15     if(x<y){
16         z++;
17         printf("你猜的日期早了，你的lucky day还没到\n");
18         if(z<3)
19           printf("再猜(1~30):");}
20     else if(x>y){
21         z++;
22          printf("你猜的日期晚了，你的lucky day已经过了\n");
23          if(z<3)
24            printf("再猜(1~30):");}
25      else{
26          printf("哇，猜中了 6");
27          break;}
28         
29      if (z==3){
30         printf("次数用完啦，偷偷告诉你：11月，你的lucky day是%d号\n",y);}}     return 0;     
31         
32     
33    

 1 #include<stdio.h>
 2  #include<stdlib.h>
 3  #include<math.h>
 4 
 5  int main(){
 6      double up,down,s;
 7     int n,a,i;
 8 
 9 
10     while(scanf("%d %d",&n,&a)!=EOF){
11             up=1.0;
12         s=0;
13         down =a;
14         for(i=1;i<=n;++i){
15          s=s+up/down;
16          up++;
17          down=down*10+a;
18         }
19         printf("n=%d,a=%d,s=%lf",n,a,s);
20         }
21     
22     return 0;
23     
24     
25 }

 1 #include<stdio.h>
 2 
 3 int main(){
 4      int i,j;
 5      for(i=1;i<=9;i++){
 6          for(j=1;j<=i;j++)
 7          printf("%d*%d=%d  ",i,j,j*j);
 8          printf("\n");
 9      }
10      
11  }

 1  #include<stdio.h>
 2  
 3  int main(){
 4      int i,j,n;
 5      scanf("%d",&n);
 6      for(i=1;i<=n;i++){
 7          for(j=1;j<i;j++)
 8            {printf("     ");}
 9            
10         for (j=1;j<=2*(n-i)+1;j++){             printf(" O ");
11              printf("   ");}
12          printf("\n");
13          for(j=1;j<i;j++)
14            {printf("     ");}
15         for (j=1;j<=2*(n-i)+1;j++){
16              printf("<H>");
17              printf("   ");}
18          printf("\n");
19          for(j=1;j<i;j++)
20           {printf("     ");}
21          for (j=1;j<=2*(n-i)+1;j++){
22              printf("I I");
23              printf("   ");}
24          printf("\n");
25          
26     }
27      return 0;
28  }