View Compilation Error

0_0_33709572_10794.cpp: In function 'int main()':
0_0_33709572_10794.cpp:3:34: error: 'scanf' was not declared in this scope
         while(~scanf("%d%d",&a,&b)){
                                  ^
0_0_33709572_10794.cpp:4:28: error: 'printf' was not declared in this scope
             printf("%d",a+b);
                            ^