View Compilation Error

0_0_14943222_24372.c: In function 'main':
0_0_14943222_24372.c:7:2: error: expected expression before '/' token
  //int op;
  ^
0_0_14943222_24372.c:15:3: error: expected expression before '/' token
   // assuming x equal 1
   ^
0_0_14943222_24372.c:18:26: error: 'M' undeclared (first use in this function)
   scanf("%d %I64u", &Q, &M);
                          ^
0_0_14943222_24372.c:18:26: note: each undeclared identifier is reported only once for each function it appears in
0_0_14943222_24372.c:19:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i=0; i<Q; i++){
   ^
0_0_14943222_24372.c:19:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_14943222_24372.c:23:5: error: 'x' undeclared (first use in this function)
     x *= v[i];
     ^