View Compilation Error

0_0_13810239_24272.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_13810239_24272.cpp:2:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_13810239_24272.cpp: In function 'int main()':
0_0_13810239_24272.cpp:9:23: error: 'scanf' was not declared in this scope
     while(scanf("%s",n)!=EOF)
                       ^
0_0_13810239_24272.cpp:9:26: error: 'EOF' was not declared in this scope
     while(scanf("%s",n)!=EOF)
                          ^
0_0_13810239_24272.cpp:12:15: error: 'strlen' was not declared in this scope
   len=strlen(n); 
               ^
0_0_13810239_24272.cpp:14:4: error: expected ';' before 'a'
    a[i]=n[len-1-i]-'0';
    ^
0_0_13810239_24272.cpp:14:23: error: expected ')' before ';' token
    a[i]=n[len-1-i]-'0';
                       ^
0_0_13810239_24272.cpp:22:18: error: 'printf' was not declared in this scope
   printf("%d\n",t);
                  ^