To generate pattern 1 12 123

#include<stdio.h>

void main()
{
int i,j,n;
clrscr();
printf("how many lines you need to print :");
scanf("%d",&n);
for(i=0;i<n;i++)
   {
   for(j=0;j<=i;j++)
      {
      printf("%d",i);
      }
    printf("\n");
   }
getch();
}