View Compilation Error

0_0_33710301_3212.cpp: In function 'int main()':
0_0_33710301_3212.cpp:4:30: error: 'scanf' was not declared in this scope
     while(~scanf("%d%d",&a,&b))
                              ^
0_0_33710301_3212.cpp:10:36: error: 'printf' was not declared in this scope
                     printf("%d\n",i);
                                    ^