void main()  

 { 
 int n,i,j;
 printf("enter the num of rows\t:");
 scanf("%d",&n);
 
 for(i=1;i<=n;i++)
 {
	 for(int k=0;k<n-i;k++)
	 printf(" ");  
	 for(j=1;j<=i;j++)
		 printf("%d ",i);
	 printf("\n");
 }
}

A SMALL IMPLEMENTATION OF POINTERS
 
#include<stdio.h>
#include<conio.h>
void main()
{
int n,*p,*q;
printf("enter the number of lines :");
scanf("%d",&n);
for(int i=1,p=&i;*p<=n;*p++)
{
printf("\n");
  for(int j=1,q=&j;*q<=*p;*q++)
{
printf("%d",*p);
printf(" ");
}
}
getch();
}

main()
{
    int i,j,n;
    printf("enter the limit");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
         
        for(j=0;j<i;j++)
        {
            printf("%d",i);
        }
        printf("\n");
    }

}