View Compilation Error

0_0_26647724_15838.cpp: In function 'int main()':
0_0_26647724_15838.cpp:7:46: error: 'scanf' was not declared in this scope
      while(scanf("%d/%d/%d",&year,&month,&day)!=EOF){
                                              ^
0_0_26647724_15838.cpp:7:49: error: 'EOF' was not declared in this scope
      while(scanf("%d/%d/%d",&year,&month,&day)!=EOF){
                                                 ^
0_0_26647724_15838.cpp:17:31: error: 'printf' was not declared in this scope
          printf("%d\n",day+sum);
                               ^