View Compilation Error

In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdbool:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:56,
                 from 0_0_37885946_30591.cpp:1:
0_0_37885946_30591.cpp: In function 'int main()':
0_0_37885946_30591.cpp:28:1: error: expected ';' before 'bool'
 bool flag = 0;                                   
 ^
0_0_37885946_30591.cpp:37:18: error: 'flag' was not declared in this scope
                  flag = 1;
                  ^
0_0_37885946_30591.cpp:42:15: error: 'flag' was not declared in this scope
          if (!flag) printf("%lld\n", sum1 - sum2);
               ^
0_0_37885946_30591.cpp:50:1: error: expected '}' at end of input
 }
 ^