View Compilation Error

0_0_14011275_26921.cpp:8:2: error: missing terminating " character
  while(scanf("%lf%lf%lf%lf,&a[n][0],&a[n][1],&a[n][2],&a[n][3])==4)
  ^
0_0_14011275_26921.cpp: In function 'int main()':
0_0_14011275_26921.cpp:9:6: error: expected ')' before ';' token
   n++;
      ^
0_0_14011275_26921.cpp:9:6: error: expected ')' before ';' token
0_0_14011275_26921.cpp:14:55: error: expected ')' before ';' token
   s=sqrt(pow(a[i][0]-a[i][2],2)+pow(a[i][1]-a[i][3],2);
                                                       ^