View Compilation Error

0_0_32882505_21620.c:2:1: error: expected identifier or '(' before '/' token
 //small root
 ^
0_0_32882505_21620.c:8:15: error: expected ';', ',' or ')' before '&' token
 void swap(int &a, int &b)
               ^
0_0_32882505_21620.c: In function 'push':
0_0_32882505_21620.c:19:5: error: 'tree' undeclared (first use in this function)
     tree[point] = number;
     ^
0_0_32882505_21620.c:19:5: note: each undeclared identifier is reported only once for each function it appears in
0_0_32882505_21620.c: In function 'pop':
0_0_32882505_21620.c:37:15: error: 'tree' undeclared (first use in this function)
     popdata = tree[point];
               ^
0_0_32882505_21620.c: In function 'main':
0_0_32882505_21620.c:83:13: error: expected expression before '/' token
             //printf("times %d\n",alltime);
             ^