foo.cc: In function 'int main()':
foo.cc:13:4: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    if(b%a==1)
    ^~
foo.cc:15:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     if(a%2!=0&&b%2!=0)
     ^~
foo.cc:7:6: warning: unused variable 'a' [-Wunused-variable]
  int a,b;
      ^
foo.cc:7:8: warning: unused variable 'b' [-Wunused-variable]
  int a,b;
        ^