example for Pyramid 1 program in c

#include<stdio.h>

void main()
{

int n,i,j;

printf("Enter a number");
scanf("%d",&n);

for(i=1;i<=n;i++)
{

  for(j=1;j<=i;j++)
          
    printf("%d",j);

printf("\n");

}

}

OUTPUT:
Enter a number 5
1
12
123
1234
12345