foo.cpp: In function 'int main()':
foo.cpp:32:4: error: expected ')' before '{' token
    {int x1,x2;
    ^
foo.cpp:41:4: error: expected ')' before 'if'
    if(i<len) 
    ^
foo.cpp:45:3: error: expected primary-expression before '}' token
   }
   ^
foo.cpp:45:3: error: expected ';' before '}' token