C language to write multi function calendar

The first code I Shared is for Suggestions for improvements. My 3 and 4 functions are empty.
  The first time to upload the code

  *** and why I upload the code so on the wrong, vc++6.0 is very good ah?? For example, some code is uploaded in the other code is not uniform specifications.

#include<stdio.h>
#include<stdlib.h>  
#include<string.h>
#include<windows.h>
#define H "%d",&y //This is a boring thing to do. Just write it down.
 
  daoshu()
   {
  int i=1,j;
  int k=0;
  system("cls"); //The function is to clear the screen with the function of #include<Stdlib. H>
  while(i<=7)       
  {  printf(" Please wait a moment ");
   for(j=1;j<=i;j++) //This is the ellipsis loop
   {
    printf(".");
   }
    k++;
    if(k==3)
    {
     i=0;
    }
   Sleep(400);
   system("cls");
   i++;
  }
   }
 
  one()
  {
   int y;
   int i,k,s=1;//Cycle number
   int j;//Set the maximum of one month to 31 days
   printf("n Please enter the number of years to display ( Format: xxxx years ):");
    scanf(H);  //Scanf (""%d",&y");
    daoshu();//Call a function
    printf("%d years n",y);
    if(y%400==0 || y%4==0 && y%100!=0)//Is it a leap year (yes)
    { 
      for(i=1;i<=12;i++)
      { j=31;//Initialization days
         if(i%2==0)
          {j=30;}
         if(i%2!=0)
           {j=31;}
         if(i==2)
          {j=j-1;}
         if(i==8)//Even Numbers alone make August 31 days
          {j=31;}
        printf("n******%d month ******n",i);  
        printf("n Monday t Tuesday t Wednesday t Thursday t Friday t Saturday t Sunday n");
       for(k=1;k<=j;k++)
       { 
       s++;
       printf("t%d",k);
        
         if(s%7==0)//The initial value is 1 when 7 is a newline
         { printf("n");} 
       }
       printf("n========================================n");
      }
    } 
    else//Not a leap year
    {
     for(i=1;i<=12;i++)
      { j=31;//Initialization days
         if(i%2==0)
          {j=30;}
         if(i%2!=0)
           {j=31;}
         if(i==2)
          {j=j-2;}
         if(i==8)//Even Numbers alone make August 31 days
          {j=31;}
       printf("n******%d month ******n",i); 
             printf("n Monday t Tuesday t Wednesday t Thursday t Friday t Saturday t Sunday n");
       for(k=1;k<=j;k++)
       { s++;
       printf("t%d",k);
         if(s%7==0)
         {printf("n");}
       }
       printf("n========================================n");
      } 
    }
 
  }  
////////////////////////////////////////////////////////////(undeveloped function reference module)
 ttc()
 {
 printf("n Function undeveloped !! Stay tuned for .n");
 }
////////////////////////////////////////////////////////////(undeveloped function reference module)
  two()
  {
   int x;
   printf("n Please enter the year you want to view: ");
   scanf("%d",&x);
    if(x%400==0 || x%4==0 && x%100!=0)
    {
     printf("n This year is a leap year !!!n");
    }
     else
     printf("nNot a leap year!!!");
  }
 
//The menu
  main()
  { 
   int x;//Option number
   char n[5],y[5]="y";//Whether to continue operation
   int a[100];
  printf(" Ten thousand calendar n");
Loop:
   printf("1. print xxxx Year month n");
   printf("2. judge xxxx Is year a leap year n");
   printf("3.***n");
   printf("4.***n");
   printf("5.exitn");
   printf("6. Whether the CLS n");
    system("color 3f");//This means a light white font with a light green background
   printf("n The serial number (1~5):");
   scanf("%d",&x);
    switch(x)
    {
    case 1: {one();break;}
    case 2: {two();break;}
    case 3: {ttc();break;}
    case 4: {ttc();break;}
CII:  case 5: {printf("( Chinese translation ) Please press any key exit!!!n( The English translation )");exit(0);}
    case 6:{system("cls");break;}
    default :printf("n Please enter the 1~5 The serial number (function block)!! ");
    }
     
 
 
 
    printf("nnWhether to continue operation(Y/N) ");
    scanf("%s",&n);
    if(strcmp(n,y)==0)
    {
      system("cls");
      goto Loop;//Jump to Loop:
    }
    else
      {
       goto CII;//Jump to the SEC:
       exit(0);//exit
      }
  }

Above is the article to share the C language written multi-functional calendar code, although not perfect, but still want to recommend to you, I hope you can like.