View Compilation Error

0_0_27063067_30021.cpp: In function 'int main()':
0_0_27063067_30021.cpp:4:26: error: 'scanf' was not declared in this scope
  while(scanf("%d%d",&A,&B)!=EOF)
                          ^
0_0_27063067_30021.cpp:4:29: error: 'EOF' was not declared in this scope
  while(scanf("%d%d",&A,&B)!=EOF)
                             ^
0_0_27063067_30021.cpp:6:21: error: 'printf' was not declared in this scope
      printf("%d",A+B);
                     ^