View Compilation Error

0_0_31219677_794.cpp: In function 'int main()':
0_0_31219677_794.cpp:5:18: error: invalid operands of types 'const char [3]' and 'int' to binary 'operator&'
 while(scanf("%d"&n)!=eof)
                  ^
0_0_31219677_794.cpp:5:19: error: 'scanf' was not declared in this scope
 while(scanf("%d"&n)!=eof)
                   ^
0_0_31219677_794.cpp:5:22: error: 'eof' was not declared in this scope
 while(scanf("%d"&n)!=eof)
                      ^
0_0_31219677_794.cpp:7:3: error: 'sum' was not declared in this scope
   sum=0;
   ^
0_0_31219677_794.cpp:8:14: error: expected ';' before ')' token
   for(n>0;n++)
              ^
0_0_31219677_794.cpp:10:23: error: 'printf' was not declared in this scope
   printf("%lu\n\n",sum);
                       ^