求解一代码a,aa,aaa,aaaa,aaaaa,aaaaaa,aaaaaaa,......的算法和 c代码？？？

#include "stdio.h"
main()
{
    int i,n,j;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
       for(j=1;j<=i;j++)
           printf("a");
    printf(",");
    }
    getch();
}

谢谢你哦！