View Compilation Error

0_0_15983294_18341.cpp: In function 'int main()':
0_0_15983294_18341.cpp:3:22: error: 'scanf' was not declared in this scope
   while(scanf("%d",&n)!=EOF);
                      ^
0_0_15983294_18341.cpp:3:25: error: 'EOF' was not declared in this scope
   while(scanf("%d",&n)!=EOF);
                         ^
0_0_15983294_18341.cpp:7:26: error: 'printf' was not declared in this scope
     printf("sum=%d\n",sum);
                          ^