View Compilation Error

0_0_22195133_13255.cpp: In function 'int main()':
0_0_22195133_13255.cpp:4:18: error: 'scanf' was not declared in this scope
     scanf("%d",&m);
                  ^
0_0_22195133_13255.cpp:7:31: error: 'EOF' was not declared in this scope
         while(scanf("%d",&n)!=EOF)
                               ^
0_0_22195133_13255.cpp:15:30: error: 'printf' was not declared in this scope
             printf("%d\n",sum);
                              ^