View Compilation Error

0_0_15876963_1942.cpp: In function 'int main()':
0_0_15876963_1942.cpp:5:32: error: 'scanf' was not declared in this scope
     while(~scanf("%ld%ld",&x,&y)){
                                ^
0_0_15876963_1942.cpp:19:33: error: 'printf' was not declared in this scope
     printf("%ld %ld\n",res1,res2);
                                 ^