View Compilation Error

0_0_19418767_6719.cpp: In function 'int main()':
0_0_19418767_6719.cpp:8:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&b)!=EOF)
                        ^
0_0_19418767_6719.cpp:8:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&b)!=EOF)
                           ^
0_0_19418767_6719.cpp:40:35: error: 'printf' was not declared in this scope
                     printf("YES\n");
                                   ^
0_0_19418767_6719.cpp:42:34: error: 'printf' was not declared in this scope
                     printf("NO\n");
                                  ^
0_0_19418767_6719.cpp:46:30: error: 'printf' was not declared in this scope
                 printf("NO\n");
                              ^