实验二 C语言分支与循环基础应用编程-526互联

#include<stdio.h>
#include<stdlib.h>
#include<time.h>

#define N 5
#define N1 374
#define N2 465

int main()
{
     int number;
     int i;
     
     srand( time(0) );

     for(i=0;i<N;++i）

number=rand()%(N2-N1+1)+N1;
printf("202383290376%04%d\n",number);
}
return 0;

}

#include <stdio.h>
#include <stdlib.h>
  
  int main()
  {
      char color;
      while(scanf("%c",&color)!= EOF){
          getchar();
          switch(color){
         case 'r':printf("stop!\n");break;
         case 'g':printf("go go go\n");break;
         case 'y':printf("wait a minute\n");break;
         default:printf("something must be wrong...\n");break;
         }
     }
     system("pause");
     return 0;
 }

　试验任务3

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
  
  int main()
  {
      int tureday,day,i;
      printf("猜猜2023年11月哪一天会是你的lucky day\n");
      printf("开始，你有三次机会，猜猜看（1~30）：");
     
     srand(time(0));//设置随机种子
     tureday=rand()%30+1;
 
     scanf("%d",&day);
     
     for(i=1;i<=3;++i){
         if(day==tureday){
             printf("哇，猜中了！\n");
             break;}
         else if(day<tureday){
             printf("你猜的日期早了，luckyday还没到\n");}
         else{
             printf("你猜的日期晚了，luckyday已经过了\n");}
         
         if(i<3){
         printf("再猜:");
         scanf("%d",&day);}
         
     }
 
     if(i==4)
         printf("次数用完，你的luckday是11月%d",tureday);
 
     system("pause");
     return 0;
}

实验任务4

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
  
  
  int tongxiang(int p){
      int m,t,q;
      m=1,t=0;
     for(q=1;q<=p;++q){
         m=m*10;}
     t=(m-1)/9;
     return t;}
 
 int main()
 {
     int n,a,t,i;
     double s;
     
     while(scanf("%d%d",&n,&a)!= EOF){
         s=0;
         for(i=1;i<=n;++i){
             t=tongxiang(i);
             s+=1.0*i/(a*t);}
         printf("n=%d,a=%d,s=%lf\n",n,a,s);}
     
     system("pause");
     return 0;
 }

实验任务5

#include <stdio.h>
#include <stdlib.h>
 #include <math.h>
  
 int main()
 {
      int i,j;
     for(i=1;i<=9;++i){
          for(j=1;j<=i;++j){
              printf("%d*%d=%d\t",j,i,i*j);}
          printf("\n");}
     system("pause");
     return 0;
 }

实验任务6

#include <stdio.h>
#include <stdlib.h>
 
 int main()
 {
     int n;
     int i,a,b;
  
      scanf("%d",&n);
 
   for(i=1;i<=n;++i){
         
        for(a=1;a<=i-1;++a){
            printf("\t");}
        for(b=1;b<=2*n-1-2*(i-1);++b){
            printf(" O\t");}
        printf("\n");
        
        
         for(a=1;a<=i-1;++a){
             printf("\t");}
         for(b=1;b<=2*n-1-2*(i-1);++b){
             printf("<H>\t");}
         printf("\n");
         
         
         for(a=1;a<=i-1;++a){
             printf("\t");}
         for(b=1;b<=2*n-1-2*(i-1);++b){
             printf("I I\t");}
         printf("\n\n");
         
     }
 
     system("pause");
     return 0;
}