图形输出（字符常量练习）

Description

Input

Output

Sample

Output 

#
##
###
####
#####
######

#include <stdio.h>
int main()
{
    int a,n;
    a = 0;n = 1;
    while(n <= 6)
    {
        for(a = 0;a < n;a++)
        {
            printf("#");
            if(a == n - 1)
            {
                printf("\n");
            }
        }
        n = n + 1;
    }
}