View Compilation Error

0_0_36955628_22709.cpp: In function 'int main()':
0_0_36955628_22709.cpp:56:62: error: expected ')' before 'priority'
                     while(!op.empty() && priority(str[i]) <1 priority(num.top()))
                                                              ^
0_0_36955628_22709.cpp:56:81: error: expected ';' before ')' token
                     while(!op.empty() && priority(str[i]) <1 priority(num.top()))
                                                                                 ^