View Compilation Error

0_0_26876794_23545.cpp: In function 'int main()':
0_0_26876794_23545.cpp:9:35: error: 'scanf' was not declared in this scope
     while(scanf("%I64d%I64d",&N,&M))
                                   ^
0_0_26876794_23545.cpp:16:27: error: 'printf' was not declared in this scope
             printf("YES\n");
                           ^
0_0_26876794_23545.cpp:18:33: error: 'printf' was not declared in this scope
             printf("POOR Haha\n");
                                 ^