C Language
#include<stdio.h>
#include<conio.h>
void main( )
{
int n, i, j;
clrscr( );
printf("Enter Number of Lines to be Printed = ");
scanf("%d", & n);
for (i = 1; i < = n; i++)
{
for (j = 1; j < = i; J++)
{
printf("%d", j);
}
printf("\n");
}
getch( );
}
/*OUTPUT*/
Enter Number of Lines to be Printed = 6
1
12
123
1234
12345
123456