51页15题，倒三角形

/* Note:Your choice is C IDE */  
#include "stdio.h"  
void main()  
{  
    int i,m,n,x;  
    printf("请输入一个正整数：\n");  
    scanf("%d",&x);  
    
    for(i = x; 1 <= i ; i--)  
    {  
    	 for(n = 1; n <= x-i; n++)  
        {  
            printf(" ");  
        }  
        for(m = 1; m <= (2*i-1); m++)  
        {  
            printf("#");  
        }  
       
        printf("\n");  
    }  
  
}