Re: [問題] for 迴圈加法問題
一個迴圈也行：
int i , n ;
ostringstream ostr ;
n = 10 ;
for ( i = 1 ; i <= n ; ++i ) {
ostr << ( i > 1 ? "+" : "" ) << i ;
cout << ostr.str() << "=" << i*(i+1)/2 << endl;
}
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推
12/31 12:39, , 1F
12/31 12:39, 1F
→
12/31 12:40, , 2F
12/31 12:40, 2F
推
12/31 12:48, , 3F
12/31 12:48, 3F
→
12/31 15:15, , 4F
12/31 15:15, 4F
→
12/31 16:05, , 5F
12/31 16:05, 5F
→
12/31 16:07, , 6F
12/31 16:07, 6F
→
12/31 16:07, , 7F
12/31 16:07, 7F
推
01/02 01:07, , 8F
01/02 01:07, 8F
→
01/02 01:08, , 9F
01/02 01:08, 9F
→
01/02 01:50, , 10F
01/02 01:50, 10F
→
01/02 10:24, , 11F
01/02 10:24, 11F
→
01/02 12:29, , 12F
01/02 12:29, 12F
→
01/02 12:32, , 13F
01/02 12:32, 13F
推
01/02 22:30, , 14F
01/02 22:30, 14F
→
01/02 22:32, , 15F
01/02 22:32, 15F
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