完成下列程序：将二维数组的右上部分置0并输出。即:
| 1 |
2 |
3 |
4 |
5 |
变成 |
1 |
0 |
0 |
0 |
0 |
| 6 |
7 |
8 |
9 |
10 |
6 |
7 |
0 |
0 |
0 |
| 11 |
12 |
13 |
14 |
15 |
11 |
12 |
13 |
0 |
0 |
| 16 |
17 |
18 |
19 |
20 |
16 |
17 |
18 |
19 |
0 |
| 21 |
22 |
23 |
24 |
25 |
21 |
22 |
23 |
25 |
0 |
# include
main( )
{ int a[5][5] = {{1,2,3,4,5},{6,7,8,9,10},{11,12,13,14,15},{16,17,18,19,20},
{21,22,23,24,25}}；
int i,j；
for(i = 0 ;i<5 ;i++ )
{
for(j = 0;j<5 ；j++ )
{ if( ① ) ② }
for(i = 0;i<5 ；i+ + )
{
for(j = 0;j<5;j + + )
printf("%d" ,a[i][j])；
③
}
} 
