View Compilation Error

0_0_33656233_9953.cpp: In function 'int main()':
0_0_33656233_9953.cpp:3:30: error: 'scanf' was not declared in this scope
     while(~scanf("%d%d",&a,&b)){
                              ^
0_0_33656233_9953.cpp:5:26: error: 'printf' was not declared in this scope
         printf("%d\n",a+b);
                          ^