ダイヤモンドパターンを印刷するプログラムをC言語で書く

First Row: Display 1
Second Row: Display 1,2,3
Third Row: Display 1,2,3,4,5
Fourth Row: Display 1,2,3,4,5,6,7
Fifth Row: Display 1,2,3,4,5,6,7,8,9
Display the same contents from 4th Row till First Row below the fifth Row.

/* Program to print Diamond Pattern */
#include<stdio.h>
int main(){
   int i,j,k;
   clrscr();
   printf("</p><p>");
   printf("Diamond Pattern");
   printf("</p><p>");
   printf("</p><p>");
   for(i = 1;i<=5;i++){
      for(j = i;j<5;j++){
         printf(" ");
      }
      for(k = 1;k<(i*2);k++){
         printf("%d",k);
      }
      printf("</p><p>");
   }
   for(i = 4;i>=1;i--){
      for(j = 5;j>i;j--){
         printf(" ");
      }
      for(k = 1;k<(i*2);k++){
         printf("%d",k);
      }
      printf("</p><p>");
   }
   getch();
   return 0;
}