Staircase.c

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
int main() {

    int i,n,j;

    scanf("%d",&n);

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

        {

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

            {if(j<=(n-i))

            printf(" ");

             else

                 printf("#");

        }

        printf("\n");

    }
    return 0;
}