Selamat Mencoba :)

#include <stdio.h>

#include <conio.h>

int main (void)

{

                int i;

                int j;

                for(i=1;i<=5;i++)

                {

                                for(j=1;j<=i;j++)

                                {

                                                printf("%d",j);

                                }

                                printf("\n");

                }

}

outputnya :