实验2 C语言分支与循环基础应用编程

 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);}}
31     return 0;     
32         
33     
34     
35 }

 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         for (j=1;j<=2*(n-i)+1;j++){
10             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 }