你第一个if没有大括号，没大括号只能执行一句，所以return 0在外面
by _up111 @ 2023-04-21 22:14:28
应改为
```cpp
if( a+b<c || b+c<a || a+c<b){
cout<<"No triangle\n";
return 0;
}
```
by _up111 @ 2023-04-21 22:15:51
@[Sam_Gamer](/user/793067)
```cpp
if( a+b<c || b+c<a || a+c<b)
cout<<"No triangle\n";
return 0;
```
《return 0;》
by ljlawa @ 2023-04-21 22:16:02
谢谢
by Sam_Gamer @ 2023-04-21 22:31:55
@[Machbrother](/user/906216) Thanks
by Sam_Gamer @ 2023-04-21 22:32:11
@[ljlawa](/user/495495) meitindong
by Sam_Gamer @ 2023-04-21 22:37:45