View Compilation Error

0_0_18853432_24829.cpp: In function 'int main()':
0_0_18853432_24829.cpp:4:20: error: 'scanf' was not declared in this scope
 while(scanf("%d",&a)!=EOF)
                    ^
0_0_18853432_24829.cpp:4:23: error: 'EOF' was not declared in this scope
 while(scanf("%d",&a)!=EOF)
                       ^
0_0_18853432_24829.cpp:11:23: error: 'printf' was not declared in this scope
 printf("%.0lf\n\n",sum);
                       ^