View Compilation Error

0_0_15273502_7526.cpp: In function 'int main()':
0_0_15273502_7526.cpp:4:25: error: expected primary-expression before '...' token
     printf("%d\n",1+2+3+...+n);
                         ^
0_0_15273502_7526.cpp:5:8: error: expected ';' at end of input
 return 0
        ^
0_0_15273502_7526.cpp:5:8: error: expected '}' at end of input