View Compilation Error

0_0_18008861_27770.cpp:5:1: error: missing terminating " character
 while(scanf("%d%d", &a, &b) == 2) { printf("%d\n, a + b) }
 ^
0_0_18008861_27770.cpp: In function 'int main()':
0_0_18008861_27770.cpp:6:13: error: expected ')' before ';' token
 assert(true);
             ^
0_0_18008861_27770.cpp:7:1: error: expected '}' at end of input
 }
 ^