View Compilation Error

1_736_3367_3252.cpp: In function 'int main()':
1_736_3367_3252.cpp:20:27: error: expected primary-expression before ')' token
         printf("%.10lf\n",)
                           ^
1_736_3367_3252.cpp:22:12: error: 'w' was not declared in this scope
         if(w==x) puts("0");
            ^