View Compilation Error

0_0_15050740_18978.cpp: In function 'int main()':
0_0_15050740_18978.cpp:5:15: error: expected primary-expression before '%' token
  while(~scanf(%d%d, &a, &b)){
               ^
0_0_15050740_18978.cpp:5:16: error: 'd' was not declared in this scope
  while(~scanf(%d%d, &a, &b)){
                ^
0_0_15050740_18978.cpp:6:10: error: expected primary-expression before '%' token
   printf(%dn, a+b);
          ^
0_0_15050740_18978.cpp:6:11: error: 'dn' was not declared in this scope
   printf(%dn, a+b);
           ^