View Compilation Error

0_0_23774150_23774.cpp: In function 'void BFS(int)':
0_0_23774150_23774.cpp:15:5: error: 'num' was not declared in this scope
  if(num==5)
     ^
0_0_23774150_23774.cpp:31:9: error: 'num' was not declared in this scope
    sstr[num] = str[i];
         ^
0_0_23774150_23774.cpp: In function 'int main()':
0_0_23774150_23774.cpp:43:3: error: 'flag' was not declared in this scope
   flag = false;
   ^
0_0_23774150_23774.cpp:46:10: error: 'Max' was not declared in this scope
   memset(Max,'\0',sizeof(maxstring));
          ^