View Compilation Error

0_0_19429550_14458.cpp:2:10: error: #include expects "FILENAME" or <FILENAME>
 #include namespace std;
          ^
0_0_19429550_14458.cpp: In function 'int main()':
0_0_19429550_14458.cpp:8:15: error: 'scanf' was not declared in this scope
  scanf("%d",&t);
               ^