View Compilation Error

0_0_18026629_22935.cpp:22:4: error: stray '\' in program
    printf("%d\n",sum\num);
    ^
0_0_18026629_22935.cpp: In function 'int main()':
0_0_18026629_22935.cpp:22:22: error: expected ')' before 'num'
    printf("%d\n",sum\num);
                      ^