View Compilation Error

0_0_18463015_22319.cpp:5:5: error: missing terminating " character
     while(scanf("%d%d,&a,&b)!=EOF);
     ^
0_0_18463015_22319.cpp: In function 'int main()':
0_0_18463015_22319.cpp:6:28: error: expected ')' before ';' token
          printf("%d\n",a+b);
                            ^
0_0_18463015_22319.cpp:6:28: error: expected ')' before ';' token
0_0_18463015_22319.cpp:7:12: error: 'o' was not declared in this scope
     return o;
            ^