View Compilation Error

0_0_24254872_5855.c: In function 'main':
0_0_24254872_5855.c:51:13: error: expected expression before '/' token
             //push(nu,opn);
             ^
0_0_24254872_5855.c:55:21: error: expected expression before '/' token
                     //pop();
                     ^
0_0_24254872_5855.c:82:29: error: expected expression before '/' token
                             //pop;
                             ^