View Compilation Error

1_798_1430_15606.cpp: In function 'int main()':
1_798_1430_15606.cpp:4:43: error: 'scanf' was not declared in this scope
     while(scanf("%ld%ld%ld%ld",&a,&b,&c,&d)!=EOF)
                                           ^
1_798_1430_15606.cpp:4:46: error: 'EOF' was not declared in this scope
     while(scanf("%ld%ld%ld%ld",&a,&b,&c,&d)!=EOF)
                                              ^
1_798_1430_15606.cpp:18:28: error: 'printf' was not declared in this scope
         printf("%lld\n",sum);
                            ^